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2016 | OCR A2 Advancing Physics B | G494 & G495 | 20th & 28th June watch

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    That was certainly interesting... Lots of wordy questions. I couldn't do the exponential disproof at all because the data that I used actually did follow an exponential relationship.. I'm fairly certain I also mucked up the double mass half pressure question where I chose the line with gradient 1. Fairly certain that gradient 1/4 was correct. Oh well, I just hope that G495 is a bit better because I really need an A.
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    (Original post by Polyrogue)
    Was struck with a splitting headache just before the exam :'( had to battle through it the entire time. I think I did quite well, but given the constant throbbing pain I feel right now I can't be sure.
    What did u do for the one with wide range of values of helium energy and the one right after with boltsman factor
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    (Original post by VlAd x)
    What did u do for the one with wide range of values of helium energy and the one right after with boltsman factor
    I guessed it was talking about Brownian motion, and so how all the particles would be randomly colliding and exchanging momentum and energy. Could be wrong.


    And to the other guy about the exponential disprove, I found that the p.d halved at like 2 s, from 6V to 3V, but then at 4s (i.e. supposedly 2 half lives later) it went down to 1V instead of 1.5V.

    Idk if that's right but it makes sense.
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    paper was fine i thought, apart from the 10 mark question using the vacuum, absolute crap honestly.
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    (Original post by danthebox)
    paper was fine i thought, apart from the 10 mark question using the vacuum, absolute crap honestly.
    i hope they take 10 marks off of the usual mark for an A.
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    (Original post by Polyrogue)
    I guessed it was talking about Brownian motion, and so how all the particles would be randomly colliding and exchanging momentum and energy. Could be wrong.


    And to the other guy about the exponential disprove, I found that the p.d halved at like 2 s, from 6V to 3V, but then at 4s (i.e. supposedly 2 half lives later) it went down to 1V instead of 1.5V.

    Idk if that's right but it makes sense.
    half lives were not constant, therefore wasn't exponential decay. i.e. 6 to 3 was 2 seconds, 3 to 1.5 was 4 seconds.
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    hard paper, rip
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    The one about the vacuum was just a joke, who writes that rubbish?
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    My calculator betrayed me, gave me k= 16 rather than k= 13 (2 S.F.) .



    But yeah that vacuum thing.
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    Thoughts on grade boundaries??
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    Quite enjoyed that tbh, don't see the problem with the vacuum question, interesting concept with forces and pressure... :cute:
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    (Original post by Wunderbarr)
    My calculator betrayed me, gave me k= 16 rather than k= 13 (2 S.F.) .



    But yeah that vacuum thing.
    What were the numbers used in that question? I can't remember
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    (Original post by js1953)
    What were the numbers used in that question? I can't remember
    5 oscillations in 3 seconds (one oscillation 0.6 seconds), 0.12kg mass
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    (Original post by uk_shahj)
    5 oscillations in 3 seconds (one oscillation 0.6 seconds), 0.12kg mass
    Thanks! What equation did you use? I'm trying to work out what I did wrong and I can't get anything close now :/
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    (Original post by Jbird1)
    Thoughts on grade boundaries??
    Well based on the usual grade boundaries I'd say 40 for an A, 39 for B, 38 for C, 37.5 for D, 37 for E and <37 for a U
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    (Original post by js1953)
    Thanks! What equation did you use? I'm trying to work out what I did wrong and I can't get anything close now :/
    T = 2pi sqrt( m/k )
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    (Original post by Wunderbarr)
    T = 2pi sqrt( m/k )
    Needed to square T :/ hopefully I get a mark for rearranging for k
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    What was the answers to the distribution one?
    0.5 and 8 or 0.5 and 2??
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    (Original post by duxlen)
    What was the answers to the distribution one?
    0.5 and 8 or 0.5 and 2??
    I put 0.5 and 8.

    definitely 0.5 but not entirely sure about 8.
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    (Original post by Wunderbarr)
    I put 0.5 and 8.

    definitely 0.5 but not entirely sure about 8.
    I put 0.5 and 8 as well. Maybe we all made the same mistake though
 
 
 
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