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

Reply 1340

Benniboi1

9

How many marks was the which combination has more energy stored in it for parallel and series?

Reply 1341

Little Wing

9

Original post by Benniboi1

How many marks was the which combination has more energy stored in it for parallel and series?

3 marks

Reply 1342

Little Wing

9

The series one had greater stored energy. because elastic potential energy is proportional to the extension of the wire.

Edit: proportional

(edited 11 years ago)

Reply 1343

jamesjiang

any unofficial mark scheme?]

Reply 1344

Benniboi1

9

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? :smile:

(I was clutching at straws a bit with that last question..)

Reply 1345

Little Wing

9

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? :smile:

(I was clutching at straws a bit with that last question..)

I would think so, but not completely sure.

Reply 1346

Benniboi1

9

Original post by Little Wing

I would think so, but not completely sure.

thanks!

Reply 1347

ragre

Original post by FK_

120 UMS

Unparseable latex formula:

[br]\begin{tabular}{|c|c|} \hline[br]Year & Mark /70 \\ \hline \hline[br]Jan 2009 & 61 \\ \hline[br]June 2009 & 70 \\ \hline[br]Jan 2010 & 60 \\ \hline[br]June 2010 & 57 \\ \hline[br]Jan 2011 & 62 \\ \hline[br]June 2011 & 59 \\ \hline[br]Jan 2012 & 58 \\ \hline[br]\end{tabular}[br]

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.

Reply 1348

cooldudeman

18

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...

Reply 1349

Kirby711

5

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...

Reply 1350

Amirrryy

1

hence 48 for an A is reasonable? :P

Reply 1351

Kirby711

5

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...

Reply 1352

Amirrryy

1

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?

Reply 1353

fuzzybear

12

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.

Reply 1354

uxa595

21

Q4c
What did people put as the answer?

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...

Reply 1356

Maphs

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 :smile:

Reply 1357

Maphs

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...

whereabouts is it, could you tell me please

Reply 1358

Amirrryy

1

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

Reply 1359

internet tough guy

13

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.

(edited 11 years ago)

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

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