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# Cosmology paper: 26 June 2003 watch

1. has anyone done question 8?
if so could u help me please.
2. here u go (**caufs rep***)
Attached Files
3. q8.doc (75.5 KB, 118 views)
4. cool. thanks for that.
do u have all the markschemes like that or did u just scan that page, because i have no markschemes.
5. 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?
6. wot is this cosmology paper people - physics a level?
7. yeah ocr physics (option module)
8. who sent it to u, can they send me others?
9. 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)
10. yeah, do u want me to go through it?
11. 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)
12. umm have u jus learnt what is in the book? seems so hard!
13. now can i have the markschemes!
14. i learnt that method, and also of some webpage, and now i just accept that method
15. do u have any other papers?
16. i have jan 2002 to june 2003 in hard copies, the earlier papers seem so much harder
17. can u scan and send them to me please?
18. 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...
19. yeah thats what my teacher said, but it is one the specification (OCR) so i just learnt it.
20. it says some where in the spec to recall and dervive it ( i jus found this out today!)

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