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    has anyone done question 8?
    if so could u help me please.
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    here u go (**caufs rep***)
    Attached Files
  1. File Type: doc q8.doc (75.5 KB, 118 views)
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    cool. thanks for that.
    do u have all the markschemes like that or did u just scan that page, because i have no markschemes.
    so could u please send me some. please.
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    i have that ms on my comp cos it was sent to me but i have no others. sorry do u have the jan 04 paper?
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    wot is this cosmology paper people - physics a level?
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    yeah ocr physics (option module)
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    who sent it to u, can they send me others?
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    my physics tutor llast year, this was the only one he had soorrry! btw do u understand how to derive, M-m=5lg (d/10) ? im finding it really hard (bloody maths)
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    yeah, do u want me to go through it?
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    2 stars, A and B. Ia/Ib=100^((mb-ma)/5)
    log both sides
    -2.5lg(Ia/Ib)=ma-mb
    let a be at 10pc so its absolute magnitude, M
    therefore, M-m=-2.5lg(I/Ib)
    but I/Ib=(d/10)^2 using inverse square law
    therefore M=m-2.5lg((d/10)^2)
    take the 2 down
    M=m-5lg(d/10)
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    umm have u jus learnt what is in the book? seems so hard!
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    now can i have the markschemes!
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    i learnt that method, and also of some webpage, and now i just accept that method
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    do u have any other papers?
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    i have jan 2002 to june 2003 in hard copies, the earlier papers seem so much harder
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    can u scan and send them to me please?
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    Are we really going to have to derive it in the exam? I hope not, I'm sure my teacher told us how to do it, but told us it wouldn't come up in the actual exam...
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    yeah thats what my teacher said, but it is one the specification (OCR) so i just learnt it.
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    it says some where in the spec to recall and dervive it ( i jus found this out today!)
 
 
 
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