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

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    (Original post by physics01)
    Guys did your paper for section b have R on the end of the code
    Yes. Astrophysics was a reserve paper.
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    (Original post by bwr19)
    if that's the schwarzschild radius question (emboldened), you forgot to square the speed of light on the denominator.
    ggrrrrrrr i know!!!!!!!!!!!! 😁😁😁😁😁😁😁😁 😁😁😁🙉😁😁
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    (Original post by dominicwild)
    I was thinking something along those lines. I just couldn't think how you'd do it experimentally. I just stated that you'd keep pressure constant and slowly squished some area (with a piston) with a constant amount of gas. Measuring temperature in K as you do it. It should regress close to 0 or -273 in C. Which defines absolute zero as its the lowest temperature you can get to?

    I didn't write much at all, just attempted to cover all bullet points.
    You didn't have to write how to carry out the experiment I don't think
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    (Original post by wat a wizard)
    it was a white dwarf
    Thank you Thats what I thought as well
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    (Original post by Faaiz Shah)
    That was the only mark i lost so far.
    Was it just 1 mark?
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    (Original post by wat a wizard)
    i used the fact that its power output is similar to the sun, but much hotter
    Yeah I put it was defiantly a B spectral class star but has large power so main sequence, hopefully they will award marks for explanation or in best possible case accept both for correct explanation?!
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    what did yo uget for the 6 marker calc for astro ? (-) 2.15*10^5 ?
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    (Original post by Lizzieee4)
    You didn't have to write how to carry out the experiment I don't think
    I'm sure it said "Describe an experiment..."

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    (Original post by Sbarron)
    Was it just 1 mark?
    Ye
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    (Original post by k9000)
    Why did i see 5m for range if beta isn't it 1m in air?
    should be 1m fam
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    Lost 8 marks already that's including the experiment I didn't even try to answer! And grade boundaries will be rediculously high 😥😥
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    We all have to thank the people who stole the paper, the other could have been a lot harder
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    How many marks from the.whole thing with astro+nuclear do you reckon we need for an A?
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    (Original post by QueNNch)
    I'm sure it said "Describe an experiment..."

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    Ye U did have to describe. I put measurements and tools in aswell just in case.
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    (Original post by Cruckshank)
    should be 1m fam
    Some ****bois putting 5m
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    (Original post by Cruckshank)
    should be 1m fam
    I wrote 1-3 m like that . I wonder if its right.
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    Good thing there wasn't a whole question on specific heat capacity, they can be quite nasty


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    (Original post by fruity97)
    Yeah I put it was defiantly a B spectral class star but has large power so main sequence, hopefully they will award marks for explanation or in best possible case accept both for correct explanation?!
    But it's radius was smaller than the Suns it was about the same as the earths
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    (Original post by QueNNch)
    I'm sure it said "Describe an experiment..."

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    Full details if apparatus were not required so as long as you explained how you were carrying it out briefly, it's good
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    (Original post by bwr19)
    That's what I did. 2.57-1 AU and convert to metres. Hope that's right. I presume it wanted the distance between the centres and we didnt have to remove the radii.
    Surely you would add 1 to 2.57 AU? The max distance is going to be when the earth and asteroid are aligned and at either side of the sun?
 
 
 
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