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AQA Astrophysics Exam Discussion PHYA5 Physics Unit 5 Part B watch

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    Finally someone made a Astrophysics thread !
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    (Original post by arrow_h)
    Finally someone made a Astrophysics thread !
    Only 12 hours before the exam haha
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    Man I am soooo unprepared, compared to my other exams this is the one I'm most scared of, is anyone else the same?
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    A guy just said on the other thread 'If you're doing astrophysics, you'll need to remember I=P/4pi*d^2' is this true? It isnt on the spec?
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    (Original post by arrow_h)
    Man I am soooo unprepared, compared to my other exams this is the one I'm most scared of, is anyone else the same?
    left everything for the last 2 days. Im very unprepaired but I think if the calculations are okay and I get lucky with the 6 markers and they are on things I know then I could still get a good grade
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    (Original post by Ainsleyy)
    A guy just said on the other thread 'If you're doing astrophysics, you'll need to remember I=P/4pi*d^2' is this true? It isnt on the spec?
    It's basically just the inverse square law for intensity, in other words Intensity of the object is inversely proportional to the distance from the object. Never had to use that particular equation but you do need to be aware of the inverse square relationship between intensity and distance
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    exo97 ask in here
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    6 marker predictions anyone?

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    (Original post by JPencil)
    6 marker predictions anyone?

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    Definitely star identification


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    6 marker I got
    Class K, orange, red giant
    A, white, white dwarf
    B, blue-White, main sequence

    Not sure tho


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    What did you get for distance to object from lens? I think I got 0.20
    Distance between objective and eyepiece I got 0.90
    Wasn't sure what the silicon chip questions were asking so I basically just repeated what I said tbh


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    (Original post by cowie)
    What did you get for distance to object from lens? I think I got 0.20
    Distance between objective and eyepiece I got 0.90
    Wasn't sure what the silicon chip questions were asking so I basically just repeated what I said tbh


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    I got the same values for lens and I know right?? 5 marks couldn't have been squeezed out of those questions
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    That was kinda nice. Very wordy though, not many calculations, in both part a and b
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    that was such a nice paper, what did everyone put for the star which was furthest away?
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    (Original post by TajwarC)
    That was kinda nice. Very wordy though, not many calculations, in both part a and b
    Due to this and the 6 marker requiring memorisation of classes and their temperatures etc I reckon the grade boundaries will be low (for this part at least)


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    (Original post by Mentalmirz)
    that was such a nice paper, what did everyone put for the star which was furthest away?
    The hottest one can't remember it's name, because it had the largest surface area and so largest radius and largest temperature so the power output of it would be greatest meaning very negative absolute magnitude, difference between absolute and apparent magnitudes is greatest (as it had the highest apparent magnitude)


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    (Original post by cowie)
    The hottest one can't remember it's name, because it had the largest surface area and so largest radius and largest temperature so the power output of it would be greatest meaning very negative absolute magnitude, difference between absolute and apparent magnitudes is greatest (as it had the highest apparent magnitude)


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    yeah same
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    (Original post by cowie)
    Due to this and the 6 marker requiring memorisation of classes and their temperatures etc I reckon the grade boundaries will be low (for this part at least)


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    Yeahh, the lack of calculations might cause problems but tbh the wordy questions weren't even that bad. It's just going to be difficult to get every point but I think most people would have at least written something.

    Either way I'm pretty happy tbh
 
 
 
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