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AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] Watch

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    (Original post by CD223)
    Does that mark scheme allow for other answers? It depends on what the MS actually says. "Any sensible answer" is sometimes included.

    That said, because it said "in the atmosphere", it makes me think of a particular element/compound in the atmosphere, over physical entities such as clouds.


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    Water (vapour) [or carbon dioxide]
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    (Original post by JaySP)
    Water (vapour) [or carbon dioxide]
    I guess you'll just have to accept that's all it was looking for. From the sounds of it they won't accept anything else.


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    But would they accept the answer:

    "Water vapour, pollution cloud coverage"

    Ie would I get the mark, despite giving wrong answers with it?
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    (Original post by CD223)
    I'm trying not to rely too heavily on the week between exams :L


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    I need to get going this week yeah, but my week of exams after half term are three of my easiest at least
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    (Original post by JaySP)
    But would they accept the answer:

    "Water vapour, pollution cloud coverage"

    Ie would I get the mark, despite giving wrong answers with it?
    I don't think so, as AQA don't credit students that give multiple answers with most incorrect even if one is correct.


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    (Original post by Lau14)
    I need to get going this week yeah, but my week of exams after half term are three of my easiest at least
    That's good. My exams are mainly in the second week after half term


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    (Original post by CD223)
    That's good. My exams are mainly in the second week after half term


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    My exams are three a week for three weeks and then M2 all by itself
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    (Original post by Lau14)
    My exams are three a week for three weeks and then M2 all by itself
    Ah that's more than me


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    Does anyone know when you do and don't you take into account the mass of a particle/atom when considering binding energy? Is it when they're on their own? Ie: 1 electron/neutron/proton?


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    (Original post by CD223)
    Does anyone know when you do and don't you take into account the mass of a particle/atom when considering binding energy? Is it when they're on their own? Ie: 1 electron/neutron/proton?


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    I think so? Seeing as a particle on its own can't have binding energy... definitely need to revise that bit though!
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    (Original post by Lau14)
    I think so? Seeing as a particle on its own can't have binding energy... definitely need to revise that bit though!
    Yeah I just wondered.

    In calculations though, like in June 2014 Q1(b), 2 neutrons are produced but you don't consider their mass?


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    would they ever ask us to derive the kinetic theory equation? Thanks
    ps it is mentioned in the spec
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    (Original post by Ilovemaths96)
    would they ever ask us to derive the kinetic theory equation? Thanks
    ps it is mentioned in the spec
    Yeah they could do. It's in the revision guide, spec and textbook


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    (Original post by CD223)
    Yeah they could do. It's in the revision guide, spec and textbook


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    was hoping for a different answer haha, thanks, i guess i should learn that now
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    (Original post by Ilovemaths96)
    was hoping for a different answer haha, thanks, i guess i should learn that now
    Yeah its frustrating. How do you plan on learning it? I'm still not 100% sure on it from memory - all I know is that you have to derive the force as rate of change of momentum, then pressure as force per unit area, then define the rms speed in all three directions?



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    (Original post by CD223)
    Yeah its frustrating. How do you plan on learning it? I'm still not 100% sure on it from memory - all I know is that you have to derive the force as rate of change of momentum, then pressure as force per unit area, then define the rms speed in all three directions?


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    yeah something like that haha, just gonna use my class notes and maybe a textbook from library
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    (Original post by Ilovemaths96)
    yeah something like that haha, just gonna use my class notes and maybe a textbook from library
    Sounds sensible. Good luck


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    (Original post by CD223)
    Yeah its frustrating. How do you plan on learning it? I'm still not 100% sure on it from memory - all I know is that you have to derive the force as rate of change of momentum, then pressure as force per unit area, then define the rms speed in all three directions?



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    it might even be this years 6 mark question, they havent done anything on this topic for a while
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    (Original post by Ilovemaths96)
    it might even be this years 6 mark question, they havent done anything on this topic for a while
    Good shout. Better revise it. Could be the derivation and assumptions of kinetic theory and ideal gases.


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    (Original post by CD223)
    Good shout. Better revise it. Could be the derivation and assumptions of kinetic theory and ideal gases.


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    Haha, hope it is now
 
 
 
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