x Turn on thread page Beta
 You are Here: Home >< Physics

# Edexcel Physics Unit 2 "Physics at work" June 2013 watch

• View Poll Results: The last question - Does resistance increase or decrease?
It increases ( using V=IR or some other method)
70.73%
It decreases using the 'lattice vibrations' theory
29.27%

1. (Original post by Alexsk)
I wrote that 3 is C. Is that wrong?
2. (Original post by jollygood)
Personally I am convinced it is C. Posted this earlier which shows a very similar thing from the textbook, if you look at the pictures.

(Original post by ambbs)
I put C too. I think we're right, because I remembered seeing this in the textbook Attachment 223879Attachment 223880

Posted from TSR Mobile
3. (Original post by ambbs)
Personally I am convinced it is C. Posted this earlier which shows a very similar thing from the textbook, if you look at the pictures.
Yes its C. Convinced than ever now. Thanks

Posted from TSR Mobile
4. Mgh/vit or 0.5mv2/vit
5. (Original post by vinhvu95)
Did anyone see through the trick question in question 17? It wasn't a negative gradient graph, because that's when the voltmeter is measuring the load resistance, but in this question the voltmeter was measuring the Pd at the battery, so it would've been a positive graph

Posted from TSR Mobile
I got confused by that question, as you said, the question was asking about the p.d. across the cell hence I drew a positive gradient graph, but I have no idea if its right
6. any one want to guess GRADE BOUNDARIES!!!!!!!!!!!!
7. Mgh/vit or 0.5mv2/vit
does that mean that the q has two answers since mgh= 0.5mv2
8. (Original post by TheGoldenRatio)
any one want to guess GRADE BOUNDARIES!!!!!!!!!!!!
54
9. anyone??
11. agreed as 54 for an A
12. What are the grade boundaries likely to be for C/D?
13. (Original post by frannyw)
What are the grade boundaries likely to be for C/D?
Count your way every 5 marks down from whatever you think will be for an A.
14. Please someone answer the Doppler Effect because I do not remember the alternatives...
15. (Original post by Alexsk)
Please someone answer the Doppler Effect because I do not remember the alternatives...
Doppler effect? Which is that?

Posted from TSR Mobile
16. (Original post by TheGoldenRatio)
agreed as 54 for an A
i really want the A boundary to be that low but tbh i don't think it will be lower than 58 for an A
that is just my opinion :P feel free to disagree
17. (Original post by Freddy-Francis)
Doppler effect? Which is that?

Posted from TSR Mobile
The one about S and O (one is a source the other is an observer)
i think the answer is C .. both move towards each other so frequency increases?
18. (Original post by x0x)
The one about S and O (one is a source the other is an observer)
i think the answer is C .. both move towards each other so frequency increases?
i cant remember. I put C or D i think
19. (Original post by x0x)
Trace Y and move it backwards a quarter of a cycle
You will find that it goes over X
so i think its D
nevertheless you may be right :P
I put D but unfortunately I've realized it must be C The question doesn't tell us which way the wave is moving, it is a displacement TIME graph. We can't use the 'tracing' method, so yeah we were tricked

The only possible option is C
20. (Original post by GCSE-help)
I put D but unfortunately I've realized it must be C The question doesn't tell us which way the wave is moving, it is a displacement TIME graph. We can't use the 'tracing' method, so yeah we were tricked

The only possible option is C
DAMN!

* I put C

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: December 18, 2013
Today on TSR

### Been caught plagiarising...

...for the 2nd time this year

### Mum says she'll curse me if I don't go to uni

Discussions on TSR

• Latest
Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE