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Edexcel A2 Physics Unit 5 'Physics from Creation to Collapse' watch

1. (Original post by Sasukekun)
Aha basically I can't read. It says;

'Doctors wish to prescribe a sample of I-131 of activity 1.5 MBq. The sample is prepared exactly 25 hours before it is due to be swallowed by the patient. Calculate the activity that the sample should have when it is prepared'.

Basically I thought it said it had an activity of 1.5 MBq when it's prepared, calculate the activity of the sample when it is prescribed (so the activity would have decreased).

But it says it had 1.5 MBq when it's prescribed...I should have worked out what the activity was 24 hours before this >_<.
You might loose 1 or 2 marks.
BUT you have lost them pointlessly.
2. (Original post by fredbraty)
for which question do you talk about?
17C
3. (Original post by Pegasus92)
17C
pegasus come on facebook.it is faster there .
4. (Original post by Xtian)
I also wrote the same as you guys for part 3. But I think we were supposed to talk about how calculating the age of the universe from 1/H is assuming a constant rate of expansion, and how gravitational forces have slowed the expansion down, and maybe a bit about dark matter and dark energy.

Anyway, we might get 1 or 2 marks out of 3.
yeah lets hope.
5. (Original post by fredbraty)
pegasus come on facebook.it is faster there .
Ill be online in a minute.
6. Guys what did you work out for 14 b ii)?
7. (Original post by Sasukekun)
Guys what did you work out for 14 b ii)?
found the difference in mass and then used E=mc squared
you?
8. (Original post by Pegasus92)
found the difference in mass and then used E=mc squared
you?
Yeah, I got 5.65 MeV I think.
9. (Original post by Sasukekun)
Yeah, I got 5.65 MeV I think.
I too think so.
10. (Original post by Sasukekun)
Yeah, I got 5.65 MeV I think.

I will make an unofficial mark scheme for you people!
11. Pegasuuuuuuuuuuuuuuuuuuuuus?Wher e are you????????????
12. http://www.guardian.co.uk/education/...ereducation.uk

Original article with Simon [email protected] Melua.

Read the ending. The question told us to discuss. Maybe we had to say something like it's not a guess because of the amount of work put it... but Katie [&others] may have thought its a guess because of the large uncertainties.

Thanks for the paper
13. (Original post by Doughboy)
http://www.guardian.co.uk/education/...ereducation.uk

Original article with Simon [email protected] Melua.

Read the ending. The question told us to discuss. Maybe we had to say something like it's not a guess because of the amount of work put it... but Katie [&others] may have thought its a guess because of the large uncertainties.

Thanks for the paper
cool Doughboy, hw did you find the article?
14. (Original post by fredbraty)

I will make an unofficial mark scheme for you people!
I have attempted one, whether it is right or not is a different matter
15. anyone got an unofficial mark scheme. cheers
16. (Original post by Jamo1991)
I have attempted one, whether it is right or not is a different matter
Are you posting it?
17. (Original post by abs123456)
anyone got an unofficial mark scheme. cheers
fredbrety told she'll post one.
18. http://www.scribd.com/doc/33782843

tell me of any changes i should make
19. (Original post by Jamo1991)
http://www.scribd.com/doc/33782843

tell me of any changes i should make
thanks
downloding it atm.
20. (Original post by Pegasus92)
thanks
downloding it atm.
No problem

Tell me what you think of it and if I need to change anything

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