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AQA Physics PHYA5 - 28th June 2016 [Exam Discussion Thread] watch

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    Anyone got the unofficial mark scheme for the normal paper and turning points, you wazzocks?😊💕
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    (Original post by tanyapotter)
    what did people put for why the nuclear fusion reaction is more powerful, and why at a larger distance from a source you should measure the count rate longer?
    More energy is required to fuse 2 hydrogen atoms for example because they have low binding energies of around 1.1MeV so to get that closer to 8.7MeV a lot more energy is required.

    At a larger distance there may not be much exposure initially so you you wait for the count rate to become a roughly stable number.
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    is someone preparing an unofficial mark scheme?

    i made so many silly mistakes in this - i think i got around 55/75 would that be enough for a B?

    i need an A overall, and i got 270 UMS last year so i need 210 ums this year to scrape an A but i don't know if i've done it tbh
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    (Original post by tanyapotter)
    is someone preparing an unofficial mark scheme?

    i made so many silly mistakes in this - i think i got around 55/75 would that be enough for a B?
    June 2014 was a similar difficulty and it was 51/75 for an A*, 45/75 for an A

    You've done way more than enough for a B haha
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    (Original post by tanyapotter)
    what did people put for why the nuclear fusion reaction is more powerful, and why at a larger distance from a source you should measure the count rate longer?
    I put about the gradient because a certain nucleon number change gives a larger increase in binding energy per nucleon. I put about at a larger distance the counts per minute will vary more so a longer time will reduce % uncertainty and stuff like that.
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    how many marks for each q on nuclear paper
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    (Original post by Yo12345)
    Wavelength/4


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    Why 4?

    Ffs lol. That gets the distance between nodes and anti nodes right?
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    For the first question for TP, the conclusions:

    I put that cathode rays have a negative charge. And that they have energy, momentum and mass. Is this ok?


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    (Original post by lucabrasi98)
    Why 4?

    Ffs lol. That gets the distance between nodes and anti nodes right?
    Distance between 2 nodes is wl/2. Distance between node and antinode is half that


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    (Original post by kelvin1338)
    June 2014 was a similar difficulty and it was 51/75 for an A*, 45/75 for an A

    You've done way more than enough for a B haha
    god, i hope so! so you definitely don't think the boundaries will be as high as june 15 (51/75) for a B, right? because people are saying they found this paper really easy!
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    (Original post by tanyapotter)
    god, i hope so! so you definitely don't think the boundaries will be as high as june 15 (51/75) for a B, right? because people are saying they found this paper really easy!
    Last year's paper was insanely simple. Close to the easiest they've ever made I think. This was quite a bit harder, with some of the worded questions.
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    In turning points, I put the mass difference to 4 sig figs because all the values I used for the calculation were also 4 sig figs (or more). That wouldn't be a problem right?
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    (Original post by GeorgiaAnne)
    I did! Thought it was v low considering water is about 4900
    yh same lol
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    (Original post by tanyapotter)
    god, i hope so! so you definitely don't think the boundaries will be as high as june 15 (51/75) for a B, right? because people are saying they found this paper really easy!
    i think itll be similar - it certainly wasn't above average difficulty
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    Applied physics anyone? What did u get for the efficiency
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    (Original post by Sid1234)
    i think itll be similar - it certainly wasn't above average difficulty
    Agreed it wasn't more difficult than previous years, but last year's paper was easier than any of the other papers in my opinion.
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    (Original post by Sid1234)
    i think itll be similar - it certainly wasn't above average difficulty
    do you think it'll be similar to june 2010?

    in june 2010:
    100 UMS: 67
    A* - 60
    A - 53
    B - 46

    ?
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    (Original post by tanyapotter)
    do you think it'll be similar to june 2010?

    in june 2010:
    100 UMS: 67
    A* - 60
    A - 53
    B - 46

    ?
    That seems pretty fair to me!
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    (Original post by perpetua)
    Applied physics anyone? What did u get for the efficiency
    around 0.3 but im not sure my indicated power was correct
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    (Original post by tanyapotter)
    god, i hope so! so you definitely don't think the boundaries will be as high as june 15 (51/75) for a B, right? because people are saying they found this paper really easy!
    June 2015 was more straightforward, but this wasn't the hardest paper they've set. Boundary predictions are a tough call for this one. It partially depends on how strict/lenient the mark scheme is!
 
 
 
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