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

1. (Original post by Jamo1991)
http://www.scribd.com/doc/33782843

tell me of any changes i should make
Why is 12
7/8 and not 1/8?
2. (Original post by Pegasus92)
Why is 12
7/8 and not 1/8?
because it asks for the fraction of the atoms that WILL have decayed, so 7/8 will have decayed, i think anyway
3. (Original post by Jamo1991)
because it asks for the fraction of the atoms that WILL have decayed, so 7/8 will have decayed, i think anyway
How many marks is that part?
4. (Original post by Pegasus92)
How many marks is that part?
2 so i guess you would get 1 for 1/8
5. (Original post by Jamo1991)
2 so i guess you would get 1 for 1/8
ohh I lose 1 more mark then
attachement.
6. (Original post by Jamo1991)
No problem

Tell me what you think of it and if I need to change anything
others seem ok.
How much are you expecting?
7. (Original post by Pegasus92)
ohh I lose 1 more mark then
attachement.
How do i do that?

others seem ok.
How much are you expecting?
Erm hopefully at least 60/80 .... maximum i think i could get would be 67/80 but not too sure, how about you?
8. (Original post by Pegasus92)
others seem ok.
How much are you expecting?
hey pegasus,i am here.
9. (Original post by Jamo1991)
How do i do that?

Erm hopefully at least 60/80 .... maximum i think i could get would be 67/80 but not too sure, how about you?
Me too, in that range.
10. (Original post by fredbraty)
hey pegasus,i am here.
The unofficial marking scheme has been posted, so do we have to discuss?
11. People i am making an unofficial mark scheme right now.

It will be posted tomorrow!

12. (Original post by Pegasus92)
The unofficial marking scheme has been posted, so do we have to discuss?
oh ok i will make one alone then
13. (Original post by fredbraty)
oh ok i will make one alone then
ok, Ill be there in a minute.
14. (Original post by Pegasus92)
ok, Ill be there in a minute.
Hey if you dont want,its fine
15. (Original post by fredbraty)
Hey if you dont want,its fine
No probs, I'm jobless.
16. I'm looking at like 57/80. Can I manage to get a B with this mark?

In the last question, I didn't notice that 35 mm could be used as displacement so I started using energy considerations until the very end where I read the paragraph on the previous page and saw the 70 mm thing. Here's what I did, is it right?

V being max. speed, a=0.89 and x=35 mm

17. (Original post by Pegasus92)
No probs, I'm jobless.
Fb now
18. (Original post by Doughboy)
I'm looking at like 57/80. Can I manage to get a B with this mark?

In the last question, I didn't notice that 35 mm could be used as displacement so I started using energy considerations until the very end where I read the paragraph on the previous page and saw the 70 mm thing. Here's what I did, is it right?

V being max. speed, a=0.89 and x=35 mm

As to Jays prediction, you might get an A with that mark, but who knows you may get better.
19. (Original post by fredbraty)
Fb now
ok, Ill come.
20. A few bits I'm not sure about:

On the question asking about explaining why movement of stars relative to background stars is observed, would these three points be correct?
- This is parallax; objects further away appear to move more slowly
- The background stars are so far away that they appear not to be moving at all
- As a result the background stars' motion can be considered negligible and so are used as a reference point for nearby stars.

On the question about explaining how a radioisotope's activity in the body can be detected, would it count to say that it is a tracer and it emits radioactive radiation which can be detected by a Geiger counter?

Overall I think I could get about 70/80 for this paper.

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