Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    How was it?
    I thought it was easier than in January
    Offline

    2
    ReputationRep:
    (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
    • Thread Starter
    Offline

    0
    ReputationRep:
    May be you are right...
    do you remember what you got for the velocity of the galaxy in question 2?
    Offline

    2
    ReputationRep:
    (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
    Offline

    1
    ReputationRep:
    I already started a thread about this earlier btw :P
    • Thread Starter
    Offline

    0
    ReputationRep:
    I can only remember the red shift
    I cant remember a question about Red Shift there
    Offline

    2
    ReputationRep:
    (Original post by RussianDude)
    I cant remember a question about Red Shift there
    it is the previous part of the question you are asking
    Offline

    0
    ReputationRep:
    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!)
    Offline

    2
    ReputationRep:
    (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
    • Thread Starter
    Offline

    0
    ReputationRep:
    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...
    Offline

    1
    ReputationRep:
    I worked out the velocity of both and took an average too ....
    • Thread Starter
    Offline

    0
    ReputationRep:
    I worked out the velocity of both and took an average too ....
    yeah i think thats the right way to do it.
    • Thread Starter
    Offline

    0
    ReputationRep:
    did you do that question where you had to show that the energies are 4eV and 2eV? I couldnt do that
    Offline

    2
    ReputationRep:
    (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
    Offline

    0
    ReputationRep:
    (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....
    • Thread Starter
    Offline

    0
    ReputationRep:
    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
    Offline

    0
    ReputationRep:
    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
    Offline

    1
    ReputationRep:
    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.
    Offline

    0
    ReputationRep:
    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.
    Offline

    1
    ReputationRep:
    cant see diffraction patterns fors cd laser because its outside of visable spectrum! hence u need a detector
 
 
 

University open days

  1. Loughborough University
    General Open Day Undergraduate
    Fri, 21 Sep '18
  2. University of Cambridge
    Churchill College Undergraduate
    Fri, 21 Sep '18
  3. Richmond, The American International University in London
    Undergraduate Open Day Undergraduate
    Fri, 21 Sep '18
Poll
Which accompaniment is best?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.