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    (Original post by STATER)
    I got 200 Dioptre. v and u were given in milimetres so it seemed right at the time.
    I got 11.2 but I don't remember how.

    EDIT: I did 0.089 as the focal length, as that was the length between the lens and the image.
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    Why was it 6V and 0.36A?
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    (Original post by kingofgames010)
    Why was it 6V and 0.36A?
    If you actually did all the calculations that's what you get.

    I did all the calcs for a 1 marker, because I get extra time in the exam.
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    The focal length was 0.089m wasn't it? That was the distance between the lens and the image. Therefore the power would be 11.2 Dioptres, not 200.
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    (Original post by Minecraft27)

    EDIT: I did 0.089 as the focal length, as that was the length between the lens and the image.
    Isn't 0.089 the distance between lens and screen (projection) though? Focal length is a bit less.

    I said v=0.089 and u= 0.008? (whatever the small distance was)

    1/v = 1/u +1/f
    1/f turned out as 200
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    (Original post by Minecraft27)
    If you actually did all the calculations that's what you get.

    I did all the calcs for a 1 marker, because I get extra time in the exam.
    I did the calculation and found 6V, but how did you get from that to Current?
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    (Original post by kingofgames010)
    I did the calculation and found 6V, but how did you get from that to Current?
    With current it's I2/I1 = N1/N2.

    Maybe you did I1/I2 instead of I2/I1. VERY easy mistake to make.
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    (Original post by Minecraft27)
    With current it's I2/I1 = N1/N2.

    Maybe you did I1/I2 instead of I2/I1. VERY easy mistake to make.
    **** yeah that's what. Ah well. Thanks anyway! What are most people predicting the A grade mark will be?
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    (Original post by kingofgames010)
    **** yeah that's what. Ah well. Thanks anyway! What are most people predicting the A grade mark will be?
    73-75
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    (Original post by kingofgames010)
    **** yeah that's what. Ah well. Thanks anyway! What are most people predicting the A grade mark will be?
    I predict about 72-74.
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    (Original post by Minecraft27)
    The focal length was 0.089m wasn't it? That was the distance between the lens and the image. Therefore the power would be 11.2 Dioptres, not 200.
    I done that but it's wrong, that's calculating 1/v, when you should have used the lens equation 1/v=1/u+1/f to find out 1/f

    but woooooooooooooooooo no more exams!!!!!!!!!!!! (until uni...)
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    for the final question i converted the potential energy into eV = 3.2*10^-14 and added this to 0.511*10^6 eV to get Etotal and divided by 0.511*10^6 eV as this was Erest. But my graphical calculator gave this of gamma equal to 1 :/ but then did a separate calculation and worked out v = 2.1*10^8 ms-1, is that correct? :/ how did you do it?
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    (Original post by STATER)
    I got 200 Dioptre. v and u were given in milimetres so it seemed right at the time.
    i also got 200D using 1/v=1/f+1/u
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    (Original post by RealTime)
    I done that but it's wrong, that's calculating 1/v, when you should have used the lens equation 1/v=1/u+1/f to find out 1/f

    but woooooooooooooooooo no more exams!!!!!!!!!!!! (until uni...)
    so was it 200D ? ;/ also was it nucleon number that was not conserved in one of the questions because mass and charge were and i didn't even know what quark number is haha!! :/ what did you get the resolution of the flea image as?
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    (Original post by HennersPD)
    v = 2.1*10^8 ms-1, is that correct? :/ how did you do it?
    That is correct
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    (Original post by HennersPD)
    so was it 200D ? ;/ also was it nucleon number that was not conserved in one of the questions because mass and charge were and i didn't even know what quark number is haha!! :/ what did you get the resolution of the flea image as?
    Mass was not conserved since a gamma photon was released.
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    (Original post by HennersPD)
    so was it 200D ? ;/ also was it nucleon number that was not conserved in one of the questions because mass and charge were and i didn't even know what quark number is haha!! :/ what did you get the resolution of the flea image as?
    I can remember the resolution, although previously that 5.2x10^-7 m/pixel rings a bell

    And I wirtten quark number not conserved because a proton or neutron decayed and yeah not much else reasoning to it, might wrong lol.

    And yeah seems like it was 200D, guess i should have done more lens questions for revision lmao
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    (Original post by HennersPD)
    for the final question i converted the potential energy into eV = 3.2*10^-14 and added this to 0.511*10^6 eV to get Etotal and divided by 0.511*10^6 eV as this was Erest. But my graphical calculator gave this of gamma equal to 1 :/ but then did a separate calculation and worked out v = 2.1*10^8 ms-1, is that correct? :/ how did you do it?
    Yeah I think that's correct, I also got that too
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    Is anyone going to make a mark scheme? I can't remember many of the questions
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    Did anyone else get 2312K for the temperature for 3N electrons per second? It took me forever!
    Also now I'm worried that I didn't read it properly and can't remember if it wanted the increased temperature or how much it had increased by
 
 
 
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