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

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1. (Original post by ALevel96)
If you double the length the number of charge carriers doubles too! There's no two ways about it
dude charge density is like the amount of charge per unit volume so increasing the length wont increase amount of charge per unit volume i saw on xtreme papers u argued about it
2. (Original post by stealth_writer)
Are you sure ..?
no man he is wrong charge density is the amount of charge per unit volume so length wont affect
3. (Original post by hamzeh h)
no man he is wrong charge density is the amount of charge per unit volume so length wont affect
We shall see
4. Yo hamza what about Q10?
5. Guys isn't 57-60 very high for an A? The answer was V/2, and has nothing to do with charge carriers. Also, can somebody give a definition to critical angle? For the question about wavelength I did not write about troughs or peaks and just said its the distance travelled by a wave for a complete oscillation to take place. Is that correct?
6. (Original post by stealth_writer)
that was tricky but i sticked with polarization , sure polarization occurs at reflections and refractions but it had nothing to do with color patterns u see so it polarization
7. (Original post by Alexsk)
Guys isn't 57-60 very high for an A? The answer was V/2, and has nothing to do with charge carriers. Also, can somebody give a definition to critical angle? For the question about wavelength I did not write about troughs or peaks and just said its the distance travelled by a wave for a complete oscillation to take place. Is that correct?
After all it was an easy exam 57 is not high , higher than most year by 1 or 2 marks but i dont think its gonna be lower than 55 , its v/2 ya , critical angle the angle at which beyond total internal reflection occurs and at it the ray is refracted at angle of 90 to the normal
wave length i wrote definition of period X_x didnt read it well
8. Wavelength is simply the distance between two identical points on a wave
9. I reckon similar to the Jan paper. 56 for an A.
10. I asked if my response is correct!
11. So did everyone say polarization for No 10?

12. (Original post by B-Stacks)
I reckon similar to the Jan paper. 56 for an A.
our paper is actually similar to january 2010 which had 2-3 electricity questions and proving light particle theorem but had some super-position question yet it had a grade boundary of 45
13. (Original post by stealth_writer)
So did everyone say polarization for No 10?

since R=pl/a
increasing L will decrease the area since P is constant R increase
14. (Original post by hamzeh h)
our paper is actually similar to january 2010 which had 2-3 electricity questions and proving light particle theorem but had some super-position question yet it had a grade boundary of 45
I hope it will be under 55 so as to help for the failure in Unit 1
15. (Original post by hamzeh h)
our paper is actually similar to january 2010 which had 2-3 electricity questions and proving light particle theorem but had some super-position question yet it had a grade boundary of 45
That's true. Our paper had quite a lot of wordy questions so the grade boundaries could be lower than 56, as getting full marks on some may be quite hard.
16. Possibly though not entirely sure
17. (Original post by B-Stacks)
That's true. Our paper had quite a lot of wordy questions so the grade boundaries could be even lower, as getting full marks on some may be quite hard.
yaa didnt notice that point im guessing a full ums would be 67-68 and above
an A at 56-57
18. true true people.
19. Hi guys Did anyone get the same answer as me for the 4.3ev resonant frequency question? I did......... E=hf. 4.3x 1.6 x10^-19=6.63x10^-34f so when rearranging this, f=1 x10^15
20. (Original post by gideonv)
Hi guys Did anyone get the same answer as me for the 4.3ev resonant frequency question? I did......... E=hf. 4.3x 1.6 x10^-19=6.63x10^-34f so when rearranging this, f=1 x10^15
ya

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Updated: December 18, 2013
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