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Cosmology paper: 26 June 2003

has anyone done question 8?
if so could u help me please.
here u go (**caufs rep***)
q8.doc77.3KB
Reply 2
Avatar for davemarkey
davemarkey
OP
2
cool. thanks for that.
do u have all the markschemes like that or did u just scan that page, because i have no markschemes. :frown:
so could u please send me some. please.
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?
Reply 4
Avatar for ryan750
ryan750
2
wot is this cosmology paper people - physics a level?
yeah ocr physics (option module)
Reply 6
Avatar for davemarkey
davemarkey
OP
2
who sent it to u, can they send me others?
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)
Reply 8
Avatar for davemarkey
davemarkey
OP
2
yeah, do u want me to go through it?
Reply 9
Avatar for davemarkey
davemarkey
OP
2
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)
umm have u jus learnt what is in the book? seems so hard!
Reply 11
Avatar for davemarkey
davemarkey
OP
2
now can i have the markschemes!
Reply 12
Avatar for davemarkey
davemarkey
OP
2
i learnt that method, and also of some webpage, and now i just accept that method
Reply 13
Avatar for davemarkey
davemarkey
OP
2
do u have any other papers?
i have jan 2002 to june 2003 in hard copies, the earlier papers seem so much harder
Reply 15
Avatar for davemarkey
davemarkey
OP
2
can u scan and send them to me please?
Reply 16
Avatar for Sionide
Sionide
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...
Reply 17
Avatar for davemarkey
davemarkey
OP
2
yeah thats what my teacher said, but it is one the specification (OCR) so i just learnt it.
it says some where in the spec to recall and dervive it ( i jus found this out today!)

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