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

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    (Original post by Ninja_heel)
    For the age of the universe what did everyone get?
    4.9 * 10 ^ 17 I think or 1.4 , don't remember
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    (Original post by chizz1889)
    Another quote says that electromagnetics only occurs in the presence of electricity, was there electricity? Erm no?
    :lolwut: Do you actually understand what you're talking about?

    Electricity is a changing electric field, which induces a magnetic field. Electrostatics are a special case of this where the electric field isn't changing, so no magnetic field is induced.

    It's still electromagnetic repulsion, because the alpha particle was repulsed by the electromagnetic force.
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    (Original post by k9000)
    Anyone get 1.36x1017 for nuclear density?
    Yeah I got this too. It seemed a little low though I thought nuclear density was about 3x1017?

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    (Original post by Ninja_heel)
    Nah dude even my teacher thinks it'll be 65 for an A* which is 108ums
    Oh no!
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    (Original post by SuperMushroom)
    I googled it and it is a dwarf star, however I also said main sequence and the temperature just seemed too high


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    Do you know how many marks that was? And how did you find the rest of the paper?
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    (Original post by Andy1834)
    The highest the cap has ever been is about 59, it will not be as high as 67
    Highest cap was 67 lol june 2011
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    (Original post by DomRauba)
    5 I believe
    Are you sure? Please can someone confirm this, for both those pages?
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    (Original post by SuperMushroom)
    Rounded up to around 15 x 10 ^ 17 seconds


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    It was definitely 4.something, I converter it to years to check and 4.something*10^17 came out as 15 billion years
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    There is no chill in this thread rn. I'm pretty sure they'll accept both electromagnetic and electrostatic

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    (Original post by _Caz_)
    Yeah I got this too. It seemed a little low though I thought nuclear density was about 3x1017?

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    It's fine fam, this purple cgp said 1.47x10^17
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    (Original post by DomRauba)
    4.9 * 10 ^ 17 I think or 1.4 , don't remember
    I got 1.4 * 10^17 :hmmm:

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    (Original post by DomRauba)
    4.9 * 10 ^ 17 I think or 1.4 , don't remember
    Same
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    (Original post by DomRauba)
    4.9 * 10 ^ 17 I think or 1.4 , don't remember
    Yeah I got 4.9x10^17 also
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    (Original post by SuperMushroom)
    Rounded up to around 15 x 10 ^ 17 seconds


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    5x10^17
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    (Original post by poops13)
    Are you sure? Please can someone confirm this, for both those pages?
    2 marks for assumption , 1 for rms squared, and 2 for temperature. which was 320 K
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    (Original post by TheRAG)
    Do you know how many marks that was? And how did you find the rest of the paper?
    I believe it was 1 mark for ticking the box then 2 marks explaining, I found the rest of the paper relatively easily apart from the odd few. How about you ?


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    (Original post by DomRauba)
    2 marks for assumption , 1 for rms squared, and 2 for temperature. which was 320 K
    Cheers mate, and that was for both pages yea
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    (Original post by MangoFreak)
    :lolwut: Do you actually understand what you're talking about?

    Electricity is a changing electric field, which induces a magnetic field. Electrostatics are a special case of this where the electric field isn't changing, so no magnetic field is induced.

    It's still electromagnetic repulsion, because the alpha particle was repulsed by the electromagnetic force.
    Yes I do, electricity requires a flow of electrons but this was alpha particles not electrons so there wasn't electricity! If it were electrons being deflected by the nuclei I'd agree with you as a magnetic field would be induced but in this case it wont
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    (Original post by Ninja_heel)
    For the age of the universe what did everyone get?
    About 4.8*10^17 s so around 15 billion years. I just did d/v because there was no point calculating the hubble constant. Are you allowed to do that?
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    (Original post by StarvingAutist)
    About 4.8*10^17 s so around 15 billion years. I just did d/v because there was no point calculating the hubble constant. Are you allowed to do that?
    Yeah that's what I did after converting LY to m 😛
 
 
 
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