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AQA AS Physics A Unit 2 25/05/12 - PHYA2

Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.

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• View Poll Results: Difficulty of exam (120 UMS boundaries)
Very easy (68-70 for 120 UMS)
3.74%
Easy (64-67 for 120 UMS)
32.71%
Medium (60-63 for 120 UMS)
49.53%
Hard (57-59 for 120 UMS)
14.02%

1. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
How many marks was the which combination has more energy stored in it for parallel and series?
2. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Benniboi1)
How many marks was the which combination has more energy stored in it for parallel and series?
3 marks
3. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
The series one had greater stored energy. because elastic potential energy is proportional to the extension of the wire.

Edit: proportional
Last edited by Little Wing; 26-05-2012 at 12:36.
4. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
any unofficial mark scheme?]
5. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Little Wing)
The series one had greater stored energy. because elastic potential energy is potential to the extension of the wire.
would you get all 3 marks for that? Because I said that but then said that it was because in the series combination the top spring has to support the bottom springs weight so total extension is greater meaning stored energy is greater?

(I was clutching at straws a bit with that last question..)
6. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Benniboi1)
would you get all 3 marks for that? Because I said that but then said that it was because in the series combination the top spring has to support the bottom springs weight so total extension is greater meaning stored energy is greater?

(I was clutching at straws a bit with that last question..)
I would think so, but not completely sure.
7. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Little Wing)
I would think so, but not completely sure.
thanks!
8. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by FK_)
120 UMS

Judging by this, I'd say for 120 UMS you'd have to get around the 60 mark for this paper, which, hopefully, I've barely scraped. Frankly though, it's not about how hard a paper is per se, but about how badly people do. So if the rest of the country do badly, which I think they will, the boundaries may be that smallest bit lower.
9. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by ragre)
Judging by this, I'd say for 120 UMS you'd have to get around the 60 mark for this paper, which, hopefully, I've barely scraped. Frankly though, it's not about how hard a paper is per se, but about how badly people do. So if the rest of the country do badly, which I think they will, the boundaries may be that smallest bit lower.
yep and in this thread, there were so many arguments about the spring question and phase difference one so i bet ALOT of people messed up on those. well i hope...
10. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Little Wing)
The series one had greater stored energy. because elastic potential energy is proportional to the extension of the wire.

Edit: proportional
I put that down too. I wasn't expecting the springs to come up at all though , so I wasn't very good at them...
11. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
hence 48 for an A is reasonable? :P
12. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Amirrryy)
hence 48 for an A is reasonable? :P
Well considering it did catch me out, I think so, but then again the rest of the paper was pretty good...
13. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
does anyone know what the second page of questions on the refraction/fibres was about? i remember the diagram on the first page was repeated onto the second but what was asked on that page? anyone?
14. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by ragre)
Judging by this, I'd say for 120 UMS you'd have to get around the 60 mark for this paper, which, hopefully, I've barely scraped. Frankly though, it's not about how hard a paper is per se, but about how badly people do. So if the rest of the country do badly, which I think they will, the boundaries may be that smallest bit lower.
Doubt it would be 60 for an A, yesterday was comparable with the june 2009 exam in terms of difficulty and for that paper it was 70/70 for full UMS and about 56/70 for an A grade.

Yesterday apart from the two questions (spring and phase) and maybe the satelite dish question, it was a pretty straight forward exam, those two questions can't have counted for many marks, if I can recall, the spring was 5 marks and the phase question was 4 marks. Unless this year's students are somehow much dumber than previous years (can't imagine how this could happen), I think the boundaries should be roughly the same as in june 2009, maybe even higher perhaps.
15. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Q4c
What did people put as the answer?
Attached Thumbnails

16. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Amirrryy)
does anyone know what the second page of questions on the refraction/fibres was about? i remember the diagram on the first page was repeated onto the second but what was asked on that page? anyone?
1) Name part X [1 mark]
2) Calculate the critical angle between X and the core [2 marks]
3) Calculate the angle i [1 mark]
4) Calculate the angle r [2 marks]
5) State and Explain one advantage of a smaller core. [2 marks]

There you go.

Just realised the paper has just been posted...
17. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
Hey could anyone please post up the question paper and final unofficial mark scheme without further adjustment please, so i can see what question i think i got wrong and as to calculate my final mark
18. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Kirby711)
1) Name part X [1 mark]
2) Calculate the critical angle between X and the core [2 marks]
3) Calculate the angle i [1 mark]
4) Calculate the angle r [2 marks]
5) State and Explain one advantage of a smaller core. [2 marks]

There you go.

Just realised the paper has just been posted...
19. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by Kirby711)
1) Name part X [1 mark]
2) Calculate the critical angle between X and the core [2 marks]
3) Calculate the angle i [1 mark]
4) Calculate the angle r [2 marks]
5) State and Explain one advantage of a smaller core. [2 marks]

There you go.

Just realised the paper has just been posted...
yea thanks haha
20. Re: AQA AS Physics A Unit 2 25/05/12 - PHYA2
(Original post by uxa595)
Q4c
What did people put as the answer?
THIS QUESTION!

I put that it won't have the problem of 'dispersion', then afterwards I came home and realised the textbook has it was 'multi-path dispersion', guys how ****ed am I?

NOTE: I did explain how pulses travelling on the straight line (along the central axis) will get to the end quicker than the pulses being reflected along the way, hence making the pulses longer and making it more likely it'll merge with other pulses and distorting the information carried by the pulse.
Last edited by internet tough guy; 26-05-2012 at 14:13.

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