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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. Help!!

I dont understand question 16 b on January 2009, about electricity, dont know how to do a screenshot so heres a link:

http://www.edexcel.com/migrationdocu...e_20090115.pdf

I thought if potential difference in parallel circuit is the same, and that also that lamp B is closer to cell, shouldn't lamp B be brighter than lamp A?
2. Guys,
Do we need to know De Broglie's equation? As that involves momentum and that isn't part of the syllabus

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3. (Original post by Branny101)
Guys,
Do we need to know De Broglie's equation? As that involves momentum and that isn't part of the syllabus

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No.
4. Can anyone post some resources to aid with 6PH02 revision
5. (Original post by B-Stacks)
No.
6. Can someone tell me the experiments which we have to be aware of.

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7. (Original post by blacknightking)
Can someone tell me the experiments which we have to be aware of.

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well theres emf experiment... also one for working out the restivity constant... theres one for producing stationary waves and last but not least the nature of light experiment to do with photons... someone fill in for me if i left out any others... oo probably theres that sin i sin r one too...

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8. (Original post by Jaydude)
Help!!

I dont understand question 16 b on January 2009, about electricity, dont know how to do a screenshot so heres a link:

http://www.edexcel.com/migrationdocu...e_20090115.pdf

I thought if potential difference in parallel circuit is the same, and that also that lamp B is closer to cell, shouldn't lamp B be brighter than lamp A?

Well from Que 16 a) we can say
RB>RA (resisance of bulb)
in V=IR if V is same then I inversly propotional to R
so current through A is higher than Current through B

By P=VI Power in A> Power in B
so Bulb A will be brighter.

Remember no matter where u connect bulb, resistor, Ammeter, Switch or anything in the circuit near or far, front or back of Battery it does't change Anything.
cause the current will flow through it connecting them so the order of arrangement doesn't matter.

hope it helps
9. (Original post by TheKingOfTSR)
What comes in goes out. Kirchhoff first law. So form equations for each answer ...currents in = currents out and then see which one fits the equation given by the question.
man! i still dont understand..... how come I1 and i4 be together where eqn said i1+i2 = i3+i4. .

As the waves are 180 out of phase , the wavelength should be divided by 2 ,as I think.But according to marking scheme the wavelength should be divided by 4.I don't get it.please someone help me..

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11. (Original post by blacknightking)

As the waves are 180 out of phase , the wavelength should be divided by 2 ,as I think.But according to marking scheme the wavelength should be divided by 4.I don't get it.please someone help me..

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1/2 x (wavelength) as it is 180deg out of phase.
Then divided by 2. IS this correct?
12. (Original post by Freddy-Francis)
1/2 x (wavelength) as it is 180deg out of phase.
Then divided by 2. IS this correct?
It is correct according to marking scheme.But why did u divide by 2 at the end..

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13. (Original post by blacknightking)
It is correct according to marking scheme.But why did u divide by 2 at the end..

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its there and back.

I suck at explaining
14. (Original post by Parrallax)
Can anyone post some resources to aid with 6PH02 revision
http://www.thestudentroom.co.uk/show...&page=2&page=2
See post 22
15. After that Unit 1 exam, I'm tempted to ignore all the resources and past papers. Just feel reading the book

Are the examiners the same for both units? Because whoever wrote the Unit 1 exam has some major problems.
16. i was had no tym in phy 1 ,and felt blank
17. (Original post by davidbaroi)
man! i still dont understand..... how come I1 and i4 be together where eqn said i1+i2 = i3+i4. .
it's not together.

sum up the total current coming towards the point only I1 and I2 coming in,
sum up the total going out of the point only I3 and I4, so by Kirchhoff first law currents in = currents out.

hope u understand now
18. how is everyone doing in their revision? and how many raw marks is it to obtain full ums?
19. http://www.edexcel.com/migrationdocu...e_20120307.pdf

Hi guys, can you help me with Question 7 on the Jan 12 paper (link above) ?

I know that current and resistance have an inversely proportional relationship, but I don't understand why the graph is a curve instead of a straight line. Thanks
20. (Original post by GCSE-help)
http://www.edexcel.com/migrationdocu...e_20120307.pdf

Hi guys, can you help me with Question 7 on the Jan 12 paper (link above) ?

I know that current and resistance have an inversely proportional relationship, but I don't understand why the graph is a curve instead of a straight line. Thanks

Where V is constant.

You should know what a reciprocal graph looks like.

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