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Edexcel Physics Unit 2 January 2012

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    I saw a similar question of " how is a standing wave formed" in the rev guide.
    key points are
    -wave travels across string
    -reflects at the end of the string
    -incident and relected wave superpose to form standing wave
    -antinodes are points constructive interference, nodes are points of constructive interference
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    I don't remember what I must have done for the A = P/F question but I remember getting exactly 15.
    And for the curtain question I mentioned total internal reflection as well.
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    Horrible paper, wasn't it? I really hate the long QWC-based questions; if I wanted to write huge amounts of stuff I'd have taken English...
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    (Original post by jake193)
    Horrible paper, wasn't it? I really hate the long QWC-based questions; if I wanted to write huge amounts of stuff I'd have taken English...
    Yeah, I dropped English after AS for a REASON haha.
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    For last question, i wrote
    -standing wave only formed when frequency is a multiple of fundamental frequency
    -no standing wave is formed between multiples of fundamental frequency
    -Because nL/2 has to = 2.0m(length of the string)
    -Everytime, a new standing wave is formed it has 1 more antinode than before as n increase by 1
    -because L is inversely proportional to f

    BTW, can someone reply to my query abbt UMS grade boundaries
    http://www.thestudentroom.co.uk/show...7#post36009367
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    Paper went well, although I completely bluffed my way through the gold leaf question, as I missed most of the lessons on this unit last year, and I only only started revising for this resit the day before :/. I ran out of time, just after I'd done the ohms SI units question, so I definitely missed 10 marks...

    The rest seemed pretty straightforward, and my answers seem to match the people's here.

    I doubt I'll have an A, because of the last 10 marks, but I guess whatever I get, it's bound to be better than the E I got in the June paper (still not sure how, because when I counted the max. marks I could have on that paper, I only got to 20% :P).
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    (Original post by farhanyen)
    For the 2 mark curtain question, my answer was
    -light totally internally reflects in the core of the optic fibre
    -curtain is made of optic fibre
    -light does not escape the optic fibre and is only released at the bottom of the curtain where optic fibre ends
    -hence only the bottom of the curtain is bright

    For the surface area of the solar panel question,
    -power input=power output/efficency=500/15%=3333W
    -A=P/F=3333/210=16m^2 (calculator value is 15.87)
    How did you get15m^2.
    Yh i think i did the same as you, hopefully its right
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    I completely blanked on the question with the V1 and V2. I just left it in the end. I completely made up my answer on the gold leaf question and reading what people have said on here I've got it completely wrong.

    Other than that I think it was all right, I just hope that I got a better grade than I did the first time around, which isn't too difficult , because I got a big fat E on that one.
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    (Original post by Mtice)
    I doubt I'll have an A, because of the last 10 marks, but I guess whatever I get, it's bound to be better than the E I got in the June paper (still not sure how, because when I counted the max. marks I could have on that paper, I only got to 20% :P).
    (Original post by hannah_smiles)
    I just hope that I got a better grade than I did the first time around, which isn't too difficult , because I got a big fat E on that one.
    Hahaha I got an E in this paper in June too, so anything better I'll be really happy about.
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    Mark scheme anyone??
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    (Original post by britchick)
    Mark scheme anyone??
    Can you edit your first post and add an "Edexcel" tag for this topic?
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    (Original post by Yorrap)
    Can you edit your first post and add an "Edexcel" tag for this topic?
    How do I do that?
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    (Original post by britchick)
    How do I do that?
    When you edit your first post;


    I am not sure whether this option is available for editting after a long time.
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    (Original post by Yorrap)
    When you edit your first post;

    I am not sure whether this option is available for editting after a long time.
    Wow thanks for the fantastic demonstration! Unfortunately I think you're right and it's probably too late to do that because no "label" part is available to edit. My apologies. I will do so though in the future.
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    Markscheme if anyone needs it
    Attached Files
  1. File Type: pdf 6PH02_01_msc_20120209.pdf (265.7 KB, 961 views)
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    Anyone got the question paper?....
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    (Original post by yazdan)
    Anyone got the question paper?....
    Yes I will post now
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    Question paper
    Attached Files
  2. File Type: pdf 6PH02_01_que_20120307.pdf (313.3 KB, 388 views)
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    January 2012 grade boundaries:

    http://www.edexcel.com/iwantto/I%20w...ome%20Int).pdf

    A = 55/80
    B = 49/80
    C = 43/80
    D = 38/80
    E = 33/80
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    Got my results 120 ums yay!

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