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    (Original post by mediaya)
    i did 80x10-6 - 30x10^-6= 50x10^-6
    4cm=0.04m
    so 0.04/0.000005=8000
    but because it is going there and back (full reflection) you had to divide by 2
    8000/2 = 4000 m/s

    and i know this is wrong because i divided the speed by 2 instead of dividing the TIME by 2
    how many marks would i get?

    and one more thing, i am rubbish at standard form, that's why i got it so wrong. they shuldnt be allowed to put that in...
    You'd get one definitely for applyign the equation, not sure about the other two though.
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    What was the Ray diagram question?
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    (Original post by dianmian12)
    The one with the A and B?
    yeah
    Like that graph with it as well :/
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    (Original post by mediaya)
    i put that tower doesn't fall over because the clockwise moment equals the anticlockwise moment so there is a balance and there is no resultant moment
    btw, how does the line of action lies within the base? the base was narrower than the sides
    thats what i put it asked you to talk about the moments in the question not line of action
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    What did you guys say about the angle of incidence and refraction? It was A and D right??
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    This exam was so hard, what was even going on
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    the speed of the ultraseound wave was 1600 m/s
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    Probably the best unofficial mark scheme I've seen so far. I remember a question about ticking the correct two letters for angle of incidence and angle of refraction. I think the letters were B and D but I'm unsure about whether or not this is correct - could someone clarify???? Cheers
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    What did everyone get for the critical angle of glass? The refractive index was 1.5 i think so i did 1/sin1.5=0.66666....
    That seems so wrong btw
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    What did u put for the left hand flemings rule., i git its going PQ goes down
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    (Original post by mediaya)
    What did everyone get for the critical angle of glass? The refractive index was 1.5 i think so i did 1/sin1.5=0.66666....
    That seems so wrong btw
    42
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    (Original post by harison291)
    OMG I was seriously getting scared. I don't think I had that question either.
    which question?
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    I dunno how but I got 0.5625 for the moments question. I just remembered the example in the CGP book about tension in the girder.
    And was the ultrasound question in milliseconds, because I got 0.0004
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    (Original post by chelseafc141)
    I dunno how but I got 0.5625 for the moments question. I just remembered the example in the CGP book about tension in the girder.
    And was the ultrasound question in milliseconds, because I got 0.0004
    OMG same I got 0.5625 too because we did the moment divided by 0.36 (012+0.20), but I'm not sure if it was right
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    Wasn't the last question to draw the converging lens of C to be a thinner shape as it had a high refractive index or something
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    Isnt the moments question 0.5625 Nm?
    1.5 x 1.2 = 1.8
    1.2 + 2.0 = 3.2 (distance of the chain from the pivot)
    1.8/3.2 = 0.5625
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    (Original post by surina16)
    42
    Really, how???? 😰
    Great i got that wrong again, lets go down to 35 marks then..... 😒😧
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    Tbh the first question answer is because the electromagnet is stronger and m and n is as you move closer to principal axis image gets smaller and upright at principle axis no image formed at m image is smaller and inverted


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    (Original post by Akila1)
    Isnt the moments question 0.5625 Nm?
    1.5 x 1.2 = 1.8
    1.2 + 2.0 = 3.2 (distance of the chain from the pivot)
    1.8/3.2 = 0.5625
    No it was 1.1 nm
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    (Original post by mediaya)
    Really, how???? 😰
    Great i got that wrong again, lets go down to 35 marks then..... 😒😧
    1.5 = 1/sinC
    sinC = 0.666...
    C=42(2sf)
 
 
 
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