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Thursday, 11 August 2016

Lim Jin Quan (Sri Cempaka) Scored A* for both Physics 0625 n Chemistry 0620 in May/June 2016 Exams!

This is great!

Jin Quan whatsupped a moment ago that he scored A-Star (A*) in the two subjects he took tuition from me since Dec 2015 (at RM90/hr/subject) - Physics 0625 and Chemistry 0620.

What better way to record my "heartiest congrats" and appreciation to Jin Quan than to do it through a dedicated post!

Jin Quan was a conscientious, diligent and good student with very caring Mom and Dad and a cute little sister. Tuition was held at either Publika or Valencia.

When he came to me, he wasn't sure if he could score A's for both subjects: school marks were around 60-70% - Physics was slightly better than Chemistry. So he took more hours per week of tuition for Chemistry than Physics.

After a few lessons with him, I never have any doubt that I could assist him to score at least A's for both. Why? Because he was quite mathematical and her never fail to do the homework that I ask him to do - never give me any excuses - like "forget" this or that - to avoid homework. Learning attitude was excellent and quite brainy too. So I saw no reasons why he could not be guided to score A's. And, I always reassured his Mom about this!

And, the eventual results: A* for both! Really happy for him!

Keep up the good attitude and the good work. You will continue to do well.

Best wishes, Jin Quan!

Sincerely,
Douglas

P/s:

Warm regards n heartiest congrats to your Mom n Dad too! :) 

Wednesday, 11 May 2016

Announcements - May/2016

I am pleased to announce the following:

1. My Mobile No. 011-2328 7882 will be phased out (with immediate effect).

    Reason: Due to relative lack-of-use (if compared to mobile no. 018-3722 482 and email tutortan1@gmail.com). The mobile-phone no: 018-3722 482 and my email remain the same.

2. Vacant tuition slots up for grab very soon.

    Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams were over. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

  (Edexcel Maths and SPM Maths, Physics and Chemistry can be considered)

* CIE AS/A2: Chemistry 9701

WhatsApp me Douglas at: 018-3722 482
         or, email: tutortan1@gmail.com

Thank you.

By,
Douglas.

Friday, 12 February 2016

Ting Zheng Scored A* for Physics 0625 IGCSE 2015 Winter Oct/Nov Exam n ...

On 19th Jan 2016, Ting Zheng (of Sri Cempaka) WhatsApped "Thank you Mr. Douglas, I got A* for physics :) :) :)"

Congrats conveyed but for such a score, he deserved special mention through a dedicated post - Heartiest Congrats to Ting Zheng, once again!

The tuition was conducted in the later half of 2015 in Kai Siang's place at Damansara Heights together with Kai Siang and Ronald Khoo. For 2 months or so (out of the few months), the sky was heavily shrouded with thick Indonesian haze / smog - nauseating and we took turns to have running nose and flu...The consolation was the sights of beautiful ...ah... cars at Siang's place: 3 Porsches, 1 Alphart, 1 Mercedes and 1 Audi...

Ronald scored a B. Siang did not do as well.But both were ok.

Danial who sat for CIE AS Chemistry 9701 scored B (76%) - missed 4% for an A; confident Dan will do better for A2 exams in a few months time.

Karina was back from UK - on early yesterday morning (Friday,12/2/2016) just past mid-night - for the 3rd. time in 8 months: this time is for 1-week mid-sem. break. Looking forward to meeting her on Mon (15/2) and Friday (19/2) over AQA Chemistry...She flew back to UK on 20/2(Sat) - KL to UK or UK to KL direct flight takes 12 to 15 hours one way!

Karina was back on 25/3/2016 late night for 2 weeks of sem break. Met her on on 4 occasions over AQA chemistry. She flew back to UK on 8/4/2015 night.
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Need Help In Physics, Chemistry and Maths in or around Petaling Jaya?

Good News: Vacant tuition slots are now up for grab!

(May 30th, 2016): Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams are ending. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

(Edexcel Maths and Physics; SPM Maths, Physics and Chemistry can be considered)

* CIE AS/A2: Chemistry 9701

WhatsApp me Douglas at: 018-3722 482 or, 
email: tutortan1@gmail.com

Thank you.

Thursday, 20 March 2014

SPM 2013 Results Out Today (20/03/2014, Thurs)

470,395 students sat for SPM 2013 last year.

11,892 scored FULL A's --- 244 more than SPM 2012

405 scores ALL A+s --- of which 366 were from national schools (sekolah kebangsaan).

This is the best results in 5 years. For press report, read here.

Personal notes:

My dearest disciple scored ALL A's but B+ for the controversial "Moral" paper: It's 8As and 1B+ for Mei. Congrats on the 8As and sympathy for the B+ . In PMR, she scored FULL A's!

(18.4.2014) Another student - also from Mei's school - who took Physics and Chemistry tuition from me a few months before SPM scored A's for both subjects. In fact, he scored FULL 9A's!! Congrats to Manoj! Come to think of it, the number of my tuition students who scored full A's in SPM and IGCSE exams are fast becoming uncountable...really wonderful! (Manoj has left a comment below - click 'comment' to read more!)

Mei and about 20 to 30 others (including Manoj) received their "Anugerah Cermelang Academik 2014 SPM" (SPM 2014 Academic Excellence Award) for scoring 8A's and above at their school this morning.

Mei was also the President of her school's Netball Club; Secretary of 1 of the 4 sport houses; represented school at some levels of netball competition - all these kept her quite busy actually...but it sharpens her multi-tasking skill too...

30.6.2014: Today Manoj posted a comment (please click "comment" below) to happily say that he actually scored A+ for both the subjects he took tuition from me i.e. Physics and Chemistry (not just A's)! Absolutely wonderful! Do send my regards to your parents - not forgetting your Mom's Deepavali's cookies - truly delicious! Thks Ma'am!!

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Need Help In Physics, Chemistry and Maths in or around Petaling Jaya?

Good News: Vacant tuition slots are now up for grab!

(May 30th, 2016): Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams are ending. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

(Edexcel Maths and Physics; SPM Maths, Physics and Chemistry can be considered.

* CIE AS/A2: Chemistry 9701

WhatsApp me Douglas at: 018-3722 482 or, 
email: tutortan1@gmail.com

Thank you.
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Friday, 24 January 2014

2013 Oct/Nov IGCSE Cambridge (Physics 0625) Results Are Out Today!

24.1.2014Alistair Yong called an hour ago to convey gratitude and good news: he obtained A (85 marks) for his IGCSE Cambridge Physics 0625 (Oct/Nov 2013 exams). His Mum sms too. His Mum was happy so was I. Alistair is a bright kid who has been consistent and diligent in his study...Even on the eve of his Paper 1, we spent an hour or so at TTDI Starbucks reinforcing him...the 1-to-1 hours together paid off...It's a great news for my birthday tomorrow... :)

Danial who took over Alistair's mobile informed that his score is slightly below Alistair's (he told me the details). Danial might be asking for re-marking. And, I support that because from July 2012 until his recent exams, his scores for all the exercises I gave have been consistently higher than his current score...Let's see the final outcome.

More results are pouring in ... Absalom W.  who did his IGCSE Cambridge Maths 0580 with me - meaning, I tutored him - told me that he hasn't obtained his results yet - he is from different international school. All indications are: he would do well: Fyi, he was and I think still is the 10th fastest in Malaysia for the "Rubick Cube" challenge. At Starbucks, he did it under 30 seconds (the Rubick Cube was personally 'messed-up' by me)...haha...I think to impress either cute Angela or Ayiesha rather than me, right? Well, why not? For the 10th position he did it in 20 seconds...

We studied hard and we also have fun together - interesting and memorable times. Absalom also holds a diploma in piano and teaches piano during free time...

Next, may be I should write about Angela Loo (Absalom's classmate) ....stay connected for more...

25.1.2014 (12.35 pm):
1) Angela Loo - my student for IGCSE Cambridge Physics 0625 and IGCSE Cambridge O-Maths 0580 - called to share the good news: She obtained A+ for Physics and A for her O-Maths. Fantastic! My heartiest congrats!! I also learnt that she was the top student - scoring straight/full As: 4 A+ and 2 As - her HM actually posted a congrats note in her international school's blog.

2) Birthday wishes in cutest wordings from a former student: here (doesn't show - plug-in needed)

26.1.2014:
10:46pm - received this sms from Absalom (my 2013 IGCSE Cambridge O-Maths 0580 student) : "Mr. Douglas! I failed you! :(     I got only an A." (See, scoring an A means failing me - that's the kind of attitude we want our students to have!! The target was A+)

10:57pm - replied to him: "Hey, don't be upset - you probably miss by a whisker juz like... - may be not careful in your working - still a great improvement from d day I first (met) u - ..., Congrats!!! ...Gdnite :)"

11:01pm - Absalom replied: "Hahaha! Sure! :)) (big grin) Thanks for everything! I hope you"ll never forget me! Because I will never forget a great teacher (sic: tutor) like you! Good nights."

7.2.2014 - Found out yesterday from Zach and Brandon (Angela's juniors) during their IGCSE Cambridge Maths 0580 lesson with me: that Angela not only scored A+ and A for my physics (0625) and O-maths (0580) respectively but also A+s and As for all other subjects she took - Happy go lucky Angela was the top student with 4A+s and 2As. Starbucks meal on me when we meet!!! By the way, she was the only one who won a Starbucks drink from me for successfully solving a physics challenge-question thrown at her group of 5 - that was an early sign of good things to come. I'm really happy for you, Angela!

26.4.2014
Today is the day US President Obama visited Malaysia. Air Force One touched down at Subang RMAF air base at 4.50 pm and so it was reported. Welcome to Malaysia, Mr. President! The people in this region surely have not forgotten the sacrifice and the constructive role the Americans played during World War II to end the war! Life and history would have been very different if not because of the Americans. So, a warm welcome to US President Obama!

On this historic day, at around 6 pm, Angela, Absalom and I were catching up at TTDI Starbucks.

Angela who scored FULL A's - 4 A+ (incl my physics) and 2 A's (incl. my O-maths) - may be leaving to US to further her study soon - can be as early as Sept; I may be spending some time with her over maths (trigo) and chemistry (organic compounds, etc) in the next few weeks.

Absalom looked fitter, now doing double degrees - music (piano) and vocal; and will be competing at ASEAN level music competitions held in Singapore and Thailand soon. He promises to give his best shot and if emerges winners, will email video of his performance for display in this blog.

I encouraged both to be passionate in what they are pursuing: Go all out and leave their marks on world stage! The two are potential world-beaters. Give them a bit of time - I'm sure they have a lot to offer wherever they go!

It was a nice Sat evening...and, I hope they both liked their Starbucks meals (Fusilli chicken, beef lasagna, green tea latte, caramel crm frappucino...)

Best wishes, folks!
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29.04.14

Danial's sis (Karina, IGCSE Year 10) will be joining me for physics commencing this coming Sat...Karina is from Garden Int'l School. She gave me the impression of being sharp and a quick learner in our first meeting. Expect her to do very well. Btw, she's very good-looking too :)

(Notes:
* Karina sat for IGCSE May /June 2015 exams. When the results were announced on 11th Aug 2015, true to my expectation, she scored A's for physics and chemistry - the 2 subjects she took tuition from me. In fact,  she scored 7As and 2Bs. 

* On 1st Sept 2015, she (and her family) flew to UK for her to attend a boarding school there. In the morning, I sent her my "Best Wishes". Great! 

* On 26th Oct 2015 (Mon), she was back for 2-week 1st-semester break. We went through Chemistry the next day and 4 other days and she flew back to UK on Nov 7th (Sat). Best wishes, Karina!

* On 18th Dec 2015 (Fri), Karina was back for 2-week end-of-semester break. On 21st Dec (Mon), went thru AQA chemistry with her; will do so for six 2-hr lessons with her before she goes back to UK on 3rd. Jan 2016.)

27.6.2014 (Fri)

Received a nice sms from Zach - a former tuition student who just sat for his 'Summer IGCSE Cambridge Exams'. Zach (a Singaporean) expressed gratitude for teaching him maths and asked if I have time slots for his 2 friends who will be sitting for the coming winter exams (Oct/Nov). Told him K. Xun's Monday slot had been taken up by a Korean student but Friday is available.

28.6.2014: The next day, his friends Sarah (and Shannon Khoo) followed up: After some exchanges, they decided to take up a 2-hr lesson on Fri and another 2-hr lesson on Sunday. Will keep my Saturday free. As always, I will do my best for them.

29.6.2014: Zach is very much into muzic and guitar and was very happy with his progress in maths during his months with me. Even his classmates like Kai Xun (who paid RM3200/mth) noticed his tremendous progress (Note: Zach sms his results on 12/08/2014 night - full transcript of his sms below). That's really wonderful because what we coached worked! Zach's sms mentioned that there might be more of his friends joining...When time slots are limited, may be those with attitude problems (homework given not done, email instructions not read, low on PR skills, etc...) will be dropped to make way...Folks, buck up before it's too late because this Sir may be kind but never indecisive...Get it?!.

Looking forward to my 1st lesson with Sarah and Shannon...

11.7.2014: Today was supposed to be the 1st lesson with Shannon and Sarah. However, due to the semester break, Shannon's family decided to go to Penang for a few days of family outing. Hence, 1st lesson rescheduled to 18.7.2014...this was a blessing in disguise, it gave me slightly more time to complete my preparation for them: compiling the relevant past-year questions into the 37 syllabus areas. Preparation completed in time!

18.7.2014 (Fri): 1st lesson with Sarah and Shannon - both gave me very good impression: Diligent, have complete support facilities at home (functional printers, computer with relevant soft-wares all available), can be contacted by hand-phones all the times. Good people-relation skills. Both are good-looking. Shannon goes for advanced ballet classes 4 times a week. Sarah's maternal side is VIP.

1.8.2014 (Fri): Shannon and Sarah decided to increase the lessons from 2x a week to 3x a week - 2 hours each. To allow that to happen, some adjustments and rescheduling may have to be made.

2014 May/June Results Are Out Today!

12.8.2014 (Tues) Night, 10.38 pm: Zach sms: "Sorry to bother you this late Mr. Douglas, I just got my maths results today and I scored 79 (B)...I just want to thank you for helping me achieve that from E :) " This is really wonderful. I am expecting more good news...Stay connected to this post...

13.8.2014 (Wed) Night, 8.08 pm: K. Xun sms: "...I got my Physics and Add Maths results. Both also B...I can't imagine it...They were so surprised...Thanks for teaching me. If not, don't even think I could pass..." K. Xun came to me (through Zach's recommendation) when everyone has given up hope on him. He related to me some hurtful remarks made to him in his class. My initial assessment was: He's a bright kid with very good learning attitude - very keen to learn. I knew he could be 'rescued'. So I took it as a challenge and did the best that I could for him, particularly when the parents are such a good pay-master - always paid punctually on the 1st lesson of every month (RM3200/mth). From single-digit marks (6 or 7 marks), he now obtains B for both Physics and Add Maths! His parents are happy, so am I!. Never give up on yourself even when others have given up on you!! Best wishes, K. Xun!

A Special Day to Remember!

22.8.2014 (Fri): 3 years ago, on this day in the evening, my Mum passed away at the age of 83. Mum is a great lady - very patient, kind and loving. Imagine in those days without washing machine, she would hand-wash all our clothing - 10 kids (incl. me). Hand-wash your own clothes and you will know what she must have gone through - not just for 1 day but all the years that we grew up! A great sacrifice that will never be forgotten...forever!

Whenever we returned to visit her, she would never fail to cook the dish that we individually liked!

Really regret that couldn't visit her with my kids as often as I should in her sunset years. She has many grand daughters and 3 grandsons of whom 2 grandsons (including 1st grandson) and 1 granddaughter were 'contributed' by me. Among her grown granddaughters are: an Auckland-trained doctor (now in Melbourne) and a lawyer (now working for a world-class international law firm with regional HQ in S'pore) - soon, there will be a dentist, another doctor, more lawyers and ...

Mum is very thrifty by nature: in her sunset years, although kids can afford to let her have regular hairdos, she would rather keep her simple and humble look so that the kids need not spend on her! If you ever see an old lady with a simple and humble look in the street, don't look down on her: because this old lady may just be thrifty...for her kids.

Went to a religious place to spend some time (about 30 minutes) praying for Mum and her soul. I also asked for forgiveness for failure to visit her as often as I should in her sunset years with my kids. That I regret forever... May my Mum rest in peace...On 31/3/2014 (during the Cheng Ming festival), I and my kids visited Mum's grave in Ipoh with flowers...We'll miss Mum forever...Whenever we drop by Ipoh, we would and will visit her grave...(On 16/11/2014, after spending 4-day break at Pangkor (please see below), on the way back to Klang Valley, decided to drive north to visit Mum's grave - we brought along flowers which we think Mum likes and spent some time at Mum's grave before heading back)

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12.11.2014 (Wed):

In the morning: Spent an hour or so with Shannon on IGCSE Chemistry 0620. Shannon will be sitting for Chem Papers 13 and 33 and a Biz paper as well tomorrow. Thereafter, it's a well-deserved 1.5 months break-cum-holidays for her. Happy Holidays, Shannon. By the way, you looked real great after horse-riding the other morning! Have fun!!

In the afternoon, have 2 hours of Add-Maths with my Korean student Ms Kim SH @ S. Recipe Plaza Mont Kiara. She would be visiting Universal Studio Singapore this weekend...

Karina of Gdn International School was away in UK for an entrance exams since the beginning of this month. Should be back any time now. Hope she did well. On 22nd, we will resume our physics lessons...

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Need Help In Physics, Chemistry and Maths in or around Petaling Jaya?

Good News: Vacant tuition slots are now up for grab!

(May 30th, 2016): Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams are ending. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

(Edexcel Maths and Physics; SPM Maths, Physics and Chemistry - hourly rates: min. RM80/hr 1-to-1 or RM50/hr/student for group of 2 to 4)

* CIE AS/A2: Chemistry 9701 (min RM110/hr 1-to-1)

WhatsApp me Douglas at: 018-3722 482 or, 
email: tutortan1@gmail.com

Thank you.

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13.11.2014 (Thurs) - 16.11.2014 (Sun)

Early in the morning, off I went to an island resort for a 4-day break. Manage to send a "Best Wishes" sms to Shannon for her Chem papers. Shannon informed around noon that the Chem papers were okay. This bright and charming girl will do well or very well. Hope for the best and Happy Holidays, Shannon. (When the results were out in Jan 2015, Shannon scored A (83) for her Chem, all her other subjects (biology, etc.) she scored As too - great girl!. Congrats!)

Nice seafood and highly-oxygenated air are the 2 things I liked most on my first day in the resort with Amanda and Alfred. We loved the seafood lunch and dinner - oyster omelet, oak-fried prawns and other prawn dishes, sliced fish with ginger and spring onion, seaweed soup, kai lan vegie with assortment of seafood and meat, ...- and of course the refreshing sea breeze...!

14.11.2014 (Fri): After light western breakfasts, off we went islands hopping and snorkelling. The weather was perfect: Sea was calm, sky was overcast (so no sunburn), many international tourist were joining the fun just before we left to a pristine beach for an hour of picnic. Back to the resort by noon. When back, will certainly share photos (including beautiful sun-set and the beautiful people watching it...hehe)

15.11.2014 (Sat): Both Amanda and Alfred agreed that lunch of the day was really good and worth the price...In the evening, we saw complete 'double rainbows' for the first time...really beautiful...The colours of the inside rainbow are laterally inverted from those of the outside rainbow and physics students should be able to explain that natural phenomenon...(will show photos)....to be continued...













11.8.2015 (IGCSE May/June 2015 Results Day)

IGCSE May/June 2015 exams results are known today!, Yeah, my student Karina (Gdn Int'l School) scored 7As. The 7As include the 2 subjects (physics and chemistry) she took tuition from me. She had earlier on gone to UK to attend a qualifying test for admission into a boarding school there. And, on Sept 1st 2015, she flew off to UK with her Mom and Dad, to prepare for her new education phase at the UK - ringgit's severe depreciation is NO problem to Karina's family. Best wishes!

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Need Help In Physics, Chemistry and Maths in or around Petaling Jaya?

Good News: Vacant tuition slots are now up for grab!

(May 30th, 2016): Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams are ending. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

(Edexcel Maths and Physics; SPM Maths, Physics and Chemistry - hourly rates: min. RM80/hr 1-to-1 or RM50/hr/student for group of 2 to 4)

* CIE AS/A2: Chemistry 9701 (min RM110/hr 1-to-1)

WhatsApp me Douglas at: 018-3722 482 or, 
email: tutortan1@gmail.com

Thank you.

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Thursday, 28 November 2013

SPM 2013 Physics Paper 1 Answers

2013 SPM Physics Paper 1 Answers

Here are my answers - hopefully they are the same as the examiners': 

2 A
4 B
7 C
8 B
9 D
11 A
12 D
14 A
17 C
19 A
21 A
22 C
23 A
29 D
30 D
35 B
36 B
37 A
38 C
39 C
40 A
41 D
42 B
43 D
44 A
45 A
46 D
47 B
49 C
50 B

(My answers for SPM 2013 Chemistry Paper 1 can be viewed by clicking here.

My answers for SPM 2013 Modern Maths Paper 1 (1449/1) are here.)

My Comments on Some Physics P1 Questions:

Q 30: The answer is D. More than twice before, 'telescope at normal adjustment' was tested in SPM:
          * In 2005 P2 Q11(a)(iii) - diagram @ pg. 387 of Past-Yr Papers 2005-2012 - D;
          * In 2006 P2 Q9(c)(i) - diagram @ pg. 393 of Past-Yr Papers 2005-2012 - D; and,
          * see also pg. 299 of Oxford-Fajar (2013 Ed.) Fig 5.67 for telescope - Answer D!

Q32: The answer is D. Reason:

"As water waves enter shallower region (at headland first, then only the bay), their speed slows down with the shortening of wavelength (again at headland first, then only the bay) without any change in wave frequency. This refraction of water waves results in the wavefronts  taking the shape of the shoreline with wavelengths (distance between successive wavefronts) at the headland shorter than their corresponding wavelengths at the bay as shown by the diagram. At the bay, wave energy is spread-out over longer wavefronts resulting in calmer sea due to dispersal of wave energy. Answer: D

For many other questions, I have inserted some hotlinks which you can click on to direct you to the relevant pages of this blog where the answers can be found/deduced. For examples, if you click on the hotlink of:

* Q 33 D, you will be directed to the page on "Diffraction" where its Para 6 has the same diagram as in the answer D (but in different orientation);

* Q 32 D, you will be directed to the page on "Refraction of Waves" where its Para 7 shows similar diagram and the answer should be D;

* Q 31 C, you will be directed to the page on "Diffraction" where its Para 2 shows C should be the answer;

* Q 28 A, you will be directed to the page on "Refraction" where its Para 6, pt 1 shows you the answer;

* Q 27 A, you will be directed to the page on "Light" where its Para 2(d)(v)(2) shows you the answer;

* Q 26 A, you will be directed to the page on "Refraction" where its Para 6, pt 1 shows you the answer;

* Q 25 C, you will be directed to the page on "Refraction" where its 2nd Para 6 shows you the answer;
and, so on......

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Need Help In Physics, Chemistry and Maths in or around Petaling Jaya?

Good News: Vacant tuition slots are now up for grab!

(May 30th, 2016): Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams are ending. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

(Edexcel Maths and Physics; SPM Maths, Physics and Chemistry - hourly rates: min. RM80/hr 1-to-1 or RM50/hr/student for group of 2 to 4)

* CIE AS/A2: Chemistry 9701 (min RM110/hr 1-to-1)

WhatsApp me Douglas at: 018-3722 482 or, 
email: tutortan1@gmail.com

Thank you.

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Tuesday, 26 November 2013

Interesting SPM 2013 Question on Half-Life

1) SPM 2013 Physics Paper 1 has an interesting question on half-life calculation.

Q 48 reads:

"25% of Gallium-65 atoms have decayed after 15 minutes. What is the half-life of Gallium-65?

A 30.0 minutes

B 23.4 minutes

C 15.0 minutes

D 7.5 minutes

(Shouldn't there be another choice, say:

E 36+ minutes?)

My Comments (based on info given in the Q48):

Half-life of Gallium-65 based on info given in the Q48:
25% have decayed means 75% have not decayed. And that means, its half-life > 15 minutes. So was the half-life A, B or none of the 4 given choices? Do you not agree that the half life should be calculated as follows:

The 1/4-life Method:

At the end of 15 minutes (1st 1/4-life):   
a) amount decayed = 25% = ¼ of original amount
b) amount undecayed = 75% = ¾ of original amount

At the end of 30 minutes (2nd 1/4-life):  
a) amount decayed   ¼ x ¾ of original amount = 3/16 of original amount
b) total amount decayed = (¼ + 3/16) of original amount = 7/16 of the original amount
c) total amount undecayed = (1 – 7/16) of original amount = 9/16 of the original amount

To decay to ½ (or 8/16) of original amount:
a)      A further 1/16 is to be decayed
b)      1/16 = [(1/4) x (9/16)] x (4/9)
c)      Time needed = [15 minutes] x (4/9) =  6.67 minutes

Therefore, half-life = (15 + 15 + 6.67) minutes
                               = 36.67minutes

Answer (30 minutes) cannot be the acceptable answer because in 30 minutes only 7/16 and not 1/2 (or 8/16) of the radioactive substance has decayed. Conceptually, A is a wrong answer. Q48, to me, has no acceptable answers. This is also confirmed by logarithm method of calculating half-life as follows:

Logarithm Method to Calculate Number of Half-Lives:

Let:      n = number of half-lives
            Ao = Original amount of radioactive substance (or original level of radioactivity)
            Ac = Current amount of radioactive substance (or current level of radioactivity)

Then,    (1/2)n x Ao = Ac           
                        (1/2)n = Ac/Ao
                        (1/2)n = 0.75Ao/Ao = 0.75

log both sides:      log (1/2)n = log (0.75)
 Hence,       n  = log (0.75) ÷ log (1/2) = 0.415037499 half-life

To Calculate the Half-Life, T1/2

Let       T1/2 = Half-life time
            To = Time as at original amount of radioactive substance
(or original level of radioactivity)
            Tc = Time as at current amount of radioactive substance
(or current level of radioactivity)
            n = number of half-lives

Then,    T1/2 = (Tc - To) ÷ n = 15 minutes ÷ n = 15 min ÷ [log (0.75) ÷ log (1/2)]

            T1/2 = 36.14131259

            T1/2 = 36.1 minutes

Based on facts given in Q48, logarithm method shows a half-life 36.1 minutes.

But online searches (please click here or here) show that isotopes Gallium-65  actually have a half-life of 15.2 minutes

So, which is the examiners' preferred answer and why?

Isn't this question both interesting and bewildering?! :)

In conclusion: Overall, except for Q48, Paper 1 is still a good paper - of respectable standard! :)

(10.4.2014: The examiners should have replaced the words "Gallium-65" in Q 48 with the words "isotopes-X". Otherwise, it's like a biology question on man that talks about the man having ovaries, uterus, etc. that makes the candidates wonder whether it is a question about man or something else. The more well-read the students, the more disadvantaged he/she would be - that is ridiculous!)

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Wednesday, 18 September 2013

2 Significant Errors in Malaysian Form 5 Physics and Chemistry Textbooks (KBSM)

On 10/9/2013, I wrote to Ministry of Education on the above matter; and I am glad to say that the Ministry
has agreed with my findings. And, what is heartening is that the Ministry replied within 8 days - Excellent job to all concerned 
at the Ministry of Education. The lady who handled my call - to get the correct email to send my mail - was very professional.

I therefore urge all educated parents to be vigilant and proactive about errors they detect in their kid's textbooks - 
do write to the Ministry for actions because we don't want our kids to study the wrong things and give the 
correct "wrong" answers in their public exams. 

With that, may I wish all school children sitting for PMR and SPM
very soon: Good Luck and Best Wishes!!!

(P/s: Only 2 significant errors for the many pages that I have gone through - really not bad!)

Here are my letter and the Ministry's reply:


My letter:




"10/9/2013

To: Whom It May Concern

From: A Concerned Parent

Re: Significant Errors in Malaysian Form 5 Physics and Chemistry Textbooks (KBSM)

In good faith, I write to inform about what I think are significant errors in the above-mentioned Form 5 Science Stream textbooks.

If the Ministry agrees that they are indeed serious errors, I sincerely hope that "Corrections Circulars" can be sent out urgently to notify all relevant parties - particularly to the Form 5 Science students who will be sitting for their SPM exams. very soon. The errors:

1. Form 5 Physics Textbook (KBSM):
  • At page 13: the 2nd paragraph on refraction: "By comparing the angle of incidence, i with angle of refraction, r in Figure 1.19, you will find that when waves travel from a denser medium to a less dense mediumthey are refracted towards the normal." The correct underlined wordings should be "away from normal" and not "towards the normal" . This is a very serious fundamental error!

2. Form 5 Chemistry Textbook (KBSM):
  • At page 188: The chemical formula for "lauryl alcohol" was given twice there as CH3(CH2)9CH2OH. The correct chemical formula for "lauryl alcohol" should be: CH3(CH2)10CH2OH (error highlighted in red).
I would be grateful for your follow-up actions.

Thank you.

Sincerely,
Douglas Tan
(Handphone: 011-2328 xxxx)

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Ministry of Education's Reply:

"Rough translation of the Ministry's reply (please see below for the original):

Mr. Douglas Tan.

Sir,

1. With respect, I refer to your email...

2. Your statement about the factual errors has been referred to ...(of the Ministry) for scrutiny/investigation/study.

3. Upon our scrutiny/investigation/study, we found that there is basis to your statement about the factual errors.

4. We will carry-out immediate remedial and follow-up actions on the matter.

5. We thank you for your pro-activeness and working together on the matter.

Thank you."
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The original:
Ramlan Abu Talib <ramlan@moe.gov.my>
8:51 AM (1 hour ago)
to mePengarahParidinCheKrishnanSyedSimWan
Malay
English

Translate message
Turn off for: Malay

En. Douglas Tan,

Tuan,

1.     Saya dengan hormatnya merujuk kepada e-mel tuan kepada Bahagian Buku Teks, Kementerian Pendidikan Malaysia,  bertarikh 10 September 2013 berhubung perkara di atas.

2.     Penyataan tuan terhadap kesilapan fakta dalam buku teks Physics Form 5 dan Chemistry Porm 5 KBSM telah dirujuk kepada Sektor Penerbitan Sekolah Menengah untuk penelitian.

3.     Setelah dibuat penelitian , pihak kami mendapati bahawa penyataan pihak tuan terhadap hal ini mempunyai asas.

4.     Pihak kami akan melaksanakan tindakan penambahbaikan dan tindakan susulan terhadap hal ini dengan segera.

5.     Pihak kami mengucapkan terima kasih di atas keprihatinan dan kerjasama tuan terhadap hal ini.


Sekian, terima kasih.



       ..Ramlan...
Ramlan bin Haji Abu Talib
b.p Pengarah
Ketua Unit Khidmat Selia
Sektor Penyeliaan dan Penyelidikan
Bahagian Buku Teks, Kementerian Pelajaran Malaysia
Aras 1-3, Blok E-15, Parcel E
62604 PUTRAJAYA
(03-88844484) ) (019-6644435) (Fax-03-88844489)"


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Need Help In Physics, Chemistry and Maths in or around Petaling Jaya?

Good News: Vacant tuition slots are now up for grab!

(May 30th, 2016): Summer May/June 2016 IGCSE O-level and CIE AS/A2 exams are ending. As such, some tuition slots are available for grabs on '1st-come-1st-serve". The tuition slots are for:

* IGCSE: Math 0580
                Math 0606
                Physics 0625
                Chemistry 0620

(Edexcel Maths and Physics; SPM Maths, Physics and Chemistry - hourly rates: min. RM80/hr 1-to-1 or RM50/hr/student for group of 2 to 4)

* CIE AS/A2: Chemistry 9701 (min RM110/hr 1-to-1)

WhatsApp me Douglas at: 018-3722 482 or, 
email: tutortan1@gmail.com

Thank you.
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