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# Edexcel Physics 4 - How was it? watch

1. How was it?
I thought it was easier than in January
2. (Original post by RussianDude)
How was it?
I thought it was easier than in January
Easier?
I think it was harder because we had to write many many things
3. May be you are right...
do you remember what you got for the velocity of the galaxy in question 2?
4. (Original post by RussianDude)
May be you are right...
do you remember what you got for the velocity of the galaxy in question 2?
I can only remember the red shift
one of them is 7/410
6. I can only remember the red shift
I cant remember a question about Red Shift there
7. (Original post by RussianDude)
I cant remember a question about Red Shift there
it is the previous part of the question you are asking
8. for calculating the velocity.... did we have to use both sets of lines.....
i calculated the velocity using both the 7/410...... and 11/656(i think).... and then found the average... couldnt think of ne other way......(it was 4 marks!)
9. (Original post by [_Z_])
for calculating the velocity.... did we have to use both sets of lines.....
i calculated the velocity using both the 7/410...... and 11/656(i think).... and then found the average... couldnt think of ne other way......(it was 4 marks!)
one is 0.0171 and the other is 0.0168
the difference is very small actually
10. for calculating the velocity.... did we have to use both sets of lines.....
i just used one set. but the answers should be so close anyway when you average the values...
11. I worked out the velocity of both and took an average too ....
12. I worked out the velocity of both and took an average too ....
yeah i think thats the right way to do it.
13. did you do that question where you had to show that the energies are 4eV and 2eV? I couldnt do that
14. (Original post by RussianDude)
did you do that question where you had to show that the energies are 4eV and 2eV? I couldnt do that
just apply E = hf and convert the unit to eV
15. (Original post by RussianDude)
did you do that question where you had to show that the energies are 4eV and 2eV? I couldnt do that

yeah.... i did that... u just had to use... E=hf...... and use c=f(lambda)

f=c/(lambda)..... E=Hc/(lambda)...... and u get all answers required....
16. yeah.... i did that... u just had to use... E=hf...... and use c=f(lambda)
i actually did that but got something different...strange
17. u get round 3.88ev and 1.98.... instead 4 and 2...(approx)...
the answer u get is in terms of joules . u have to convert it to ev.... by dividing by 1.6x10^-19
18. this is might sound really stupid, but what did you put for question 1.1, why it would not be possible to see the diffraction pattern from the CD laser.
19. I just got back from college having done PHY4 and 5. PHY4 was much better than January's.

For the Doppler Shift thing I used the average of the two (they were both the same to 2dp anyway).

I got something like 3.88ev and 1.9eV as you said [_Z_].
I liked the experimental write-up - I had read it in the textbook previously.
20. cant see diffraction patterns fors cd laser because its outside of visable spectrum! hence u need a detector

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Updated: June 18, 2004
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