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# 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 stealth_writer)
Grade boundries estimates for the A guys?
57-60
2. (Original post by krisshP)
Did you do that as well? Look at post 685, that's how I figure it out. They expected you to be so cunning.
i memorized all wavelengths so im pretty sure its UV
3. (Original post by hamzeh h)
57-60
Is that high compared to usual?
4. (Original post by hamzeh h)
i memorized all wavelengths so im pretty sure its UV
Wow!
5. What did people put for the effect on the current if you double length and area?
6. (Original post by krisshP)
Is that high compared to usual?
ya kinda of june 2012 it was 51 , january 2013 it was around 55 january 2010 it was 45 ( but that was weird) , usually in low 50's
7. (Original post by stealth_writer)
What did people put for the effect on the current if you double length and area?
the MCQ ? it was V/2 since length had nothing to do with it
8. what did u guys put for the refractive index graph???
9. (Original post by krisshP)
Wow!
its pretty easy my teacher wrote them
in a way so we can memorise it :P
10. (Original post by hamzeh h)
the MCQ ? it was V/2 since length had nothing to do with it
It's V/4 if you double length the number of charge carriers increase also
11. (Original post by Freddy-Francis)
what did u guys put for the refractive index graph???
vary the angles
plot a sin(I) on y -axis and sin r on x-axis graph
The gradients would be the refractive index since
refractive index = sin i/sin r
12. What about Q8 for the MCQ?
13. (Original post by ALevel96)
It's V/4 if you double length the number of charge carriers increase also
thats what many people though but charge carrier is the amount of charge per unit volume so its a property of material
14. (Original post by hamzeh h)
its pretty easy my teacher wrote them
in a way so we can memorise it :P
You must have an amazing teacher then. Mine said that at critical angle, total internal reflection occurs WTF
15. (Original post by stealth_writer)
What about Q8 for the MCQ?
it was A
16. If you double the length the number of charge carriers doubles too! There's no two ways about it
17. (Original post by krisshP)
You must have an amazing teacher then. Mine said that at critical angle, total internal reflection occurs WTF
haha he has a PHD in physics he is pretty good wow hahaha a refraction at angle of 90 to the normal occurs at critcial angle and beyond it total internal reflection occurs
18. Q3 MCQ?
19. (Original post by ALevel96)
Q3 MCQ?
That was D
20. (Original post by ALevel96)
If you double the length the number of charge carriers doubles too! There's no two ways about it
Are you sure ..?

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Updated: December 18, 2013
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