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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%

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    Does anyone know where to find Jan 13's paper with markscheme?
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    what are the chances of Edexcel screwing us over again? pretty high methinks. And they better not ask us any long ass question on some experiment, our teachers are rubbish!
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    (Original post by sarah.102)
    Does anyone know where to find Jan 13's paper with markscheme?
    6PH02_01_que_20130118.pdf
    6PH02_01_rms_20130307.pdf
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    (Original post by B-Stacks)
    Potential divider.
    Lambda=2l/n
    Pir^2
    Intensity=P/A

    There's not that many.
    Just looking through this thread what's the "Lambda=2l/n" equation for/what are the things/letters representing?
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    Can somebody please give me a model answer to explain how the photoelectric effect supports the particle model of light and not the wave model of light?
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    (Original post by sarah.102)
    Does anyone know from the top of their head what formulas we actually need to remember that aren't given on the formula sheet?
    (Original post by B-Stacks)
    Potential divider.
    Lambda=2l/n
    Pir^2
    Intensity=P/A

    There's not that many.
    There's also this one:

    f=n/2l x sqrt(T/mu)
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    definitely gonna be a tough paper
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    (Original post by Deathberries)
    Just looking through this thread what's the "Lambda=2l/n" equation for/what are the things/letters representing?
    To find the wavelength of a stationary wave. Lambda is wavelength. L is length of string/tube/or whatever. N is the number of antinodes.
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    can someone help me with june 12

    http://www.edexcel.com/migrationdocu...e_20120525.pdf

    Q5,11 (a), 15 (c), 17 b and 18 b (i)

    thanks
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    (Original post by justinawe)
    Do you know what a graph of y = \dfrac{k}{x} (where k is a constant) looks like?
    yes.... but whats the physics behind it?
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    (Original post by stealth_writer)
    yes.... but whats the physics behind it?
    Well, if you look at the graph, you've got I on the y-axis and R on the x-axis.

    Ohm's law is I = \dfrac{V}{R}

    We're told that V is constant.

    Can you see the connection here?
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    (Original post by Aerosports)
    definitely gonna be a tough paper
    What makes you say that?
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    Can someone please explain when do we have to give final answer in to 2 significant figures and when to give upto 3 significant figures? because if u don't give the answer to required no. of significant figures u cant get the final mark for correct answer?
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    (Original post by jollygood)
    Can someone please explain when do we have to give final answer in to 2 significant figures and when to give upto 3 significant figures? because if u don't give the answer to required no. of significant figures u cant get the final mark for correct answer?
    I think any answer better than 3sf is correct, unless the question says so.
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    Do you think they don't penalize if mark scheme says correct answer is 16 and we write 16.1 ? dio u think we will still get final mark?
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    (Original post by jollygood)
    Do you think they don't penalize if mark scheme says correct answer is 16 and we write 16.1 ? dio u think we will still get final mark?
    They usually have a margin of error. Unless it specifically says round your answer to a whole number or to 2sf it should be fine.
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    Any help with Jan 2012 14.b)?Name:  wda.png
Views: 98
Size:  31.8 KB
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    Guys I know that for car headlights, they dim at the start because the huge surge in current causes a drop in the voltage across the internal resistance, but why do they go on to become brighter?
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    (Original post by getoom)
    Any help with Jan 2012 14.b)?Name:  wda.png
Views: 98
Size:  31.8 KB
    Check previous page.
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    (Original post by B-Stacks)
    Check previous page.
    +1
 
 
 
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