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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. http://www.s-cool.co.uk/a-level/phys...ial-difference

How come they continued the graph below horizontal axis and to the left of the vertical axis?
2. (Original post by vinhvu95)
It wasn't Big V, it was small v that the voltmeter was measuring. Because the voltmeter was across the battery

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doesn't really make a difference the comparison should still be the same, iv just represent the IR as V that's the lost volts I think...
3. (Original post by krisshP)
http://www.s-cool.co.uk/a-level/phys...ial-difference

How come they continued the graph below horizontal axis and to the left of the vertical axis?
That's for when the voltmeter is measuring the load resistor, when the load resistor is very small pd is small and current is big, and if resistance is big then pd is big and current is small

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4. (Original post by a10)
doesn't really make a difference the comparison should still be the same, iv just represent the IR as V that's the lost volts I think...
E=V+v , V is pd of the load resistor and v is pd of internal resistance

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5. I can remember the exact value that i got for the critical angle, but it was around 47 or 48... did anyone get the same?
6. (Original post by Alexandra82)
I can remember the exact value that i got for the critical angle, but it was around 47 or 48... did anyone get the same?
yes sounds familiar I got about that
7. (Original post by ambbs)
If you look at the pictures I had in my original post you'll see why I think it's C I saw a very similar question in the textbook
the picture is different .. it starts below the axis
anyway .. when the mark scheme comes out we shall see who is right
i hope we get the grades we want
8. (Original post by a10)
yes sounds familiar I got about that
i got 48.8 .
9. (Original post by Alexandra82)
I can remember the exact value that i got for the critical angle, but it was around 47 or 48... did anyone get the same?
Yep I got that
10. (Original post by x0x)
i got 48.8 .
I cant remember my exact value but it was around there hahaha
11. What do people think the grade boundaries will be like and the overall perception of the paper in general as a unit 2 paper? (Not in comparison to unit 1, though I am relieved because I did find it better and more accessible/relevant )
12. (Original post by sarah.102)
What do people think the grade boundaries will be like and the overall perception of the paper in general as a unit 2 paper? (Not in comparison to unit 1, though I am relieved because I did find it better and more accessible/relevant )
I think it would be higher than unit 1 ( like all previous years) should be around 55ish for an A I guess

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13. (Original post by Alexsk)
Guys my father is a professor of Engineering and Modern Physics in the University of C******e and he told me that the line has a negative gradient. I hope he is not wrong because the guys from C******e will fire him!!!

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14. (Original post by vinhvu95)
I think it would be higher than unit 1 ( like all previous years) should be around 55ish for an A I guess

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Thanks. I am petrified for my physics AS, I have absolutely no idea how I've done as I sat everything for the first time in this exam season and I don't even know how my coursework went.
15. (Original post by StUdEnTIGCSE)

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What did you put for 17b, here's the QP
https://www.dropbox.com/sh/v6ydqbfrg...ZWR-r9ZOSH?lst
16. (Original post by sarah.102)
Thanks. I am petrified for my physics AS, I have absolutely no idea how I've done as I sat everything for the first time in this exam season and I don't even know how my coursework went.
Same I'm really hoping ill get an A overall but my coursework looks crap

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17. (Original post by vinhvu95)
Same I'm really hoping ill get an A overall but my coursework looks crap

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Did you get the marks back for your coursework?
18. what did you write for how ultrasound travels in the metal
19. (Original post by popo)
what did you write for how ultrasound travels in the metal
the particles in the metal oscillate parallel to the direction of the wave's propagation
since ultrasound is a longitudinal wave
20. (Original post by popo)
what did you write for how ultrasound travels in the metal
Ultrasounds is a longitudinal wave, so molecules in metal vibrate parallel to direction of wave propagation in a series of compressions and rarefactions.

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Updated: December 18, 2013
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