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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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    (Original post by stealth_writer)
    Grade boundries estimates for the A guys?
    57-60
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    (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
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    11
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    (Original post by hamzeh h)
    57-60
    Is that high compared to usual?
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    (Original post by hamzeh h)
    i memorized all wavelengths so im pretty sure its UV
    Wow!
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    What did people put for the effect on the current if you double length and area?
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    (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
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    (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
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    what did u guys put for the refractive index graph??? :eek:
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    (Original post by krisshP)
    Wow!
    its pretty easy my teacher wrote them
    in a way so we can memorise it :P
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    (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
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    (Original post by Freddy-Francis)
    what did u guys put for the refractive index graph??? :eek:
    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
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    What about Q8 for the MCQ?
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    (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
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    (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
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    (Original post by stealth_writer)
    What about Q8 for the MCQ?
    it was A
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    If you double the length the number of charge carriers doubles too! There's no two ways about it
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    (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
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    Q3 MCQ?
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    (Original post by ALevel96)
    Q3 MCQ?
    That was D
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    (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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