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Edexcel Physics 4 - How was it? watch

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    How was it?
    I thought it was easier than in January
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    (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
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    May be you are right...
    do you remember what you got for the velocity of the galaxy in question 2?
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    (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
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    I already started a thread about this earlier btw :P
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    I can only remember the red shift
    I cant remember a question about Red Shift there
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    (Original post by RussianDude)
    I cant remember a question about Red Shift there
    it is the previous part of the question you are asking
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    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!)
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    (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
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    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...
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    I worked out the velocity of both and took an average too ....
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    I worked out the velocity of both and took an average too ....
    yeah i think thats the right way to do it.
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    did you do that question where you had to show that the energies are 4eV and 2eV? I couldnt do that
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    (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
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    (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....
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    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
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    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
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    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.
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    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.
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    cant see diffraction patterns fors cd laser because its outside of visable spectrum! hence u need a detector
 
 
 
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