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    A high energy particle, travelling towards an observer with velocity v decays to
    produce a photon with energy E in the rest frame of the particle. Find the frequency
    at which this photon would be detected by the observer.

    I got f=sqrt( (1+(v/c)) / (1-(v/c) ) * (E/h)

    is this correct? the question was 6 marks and all I did was use E=hf and the doppler effect
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    (Original post by swagadon)
    A high energy particle, travelling towards an observer with velocity v decays to
    produce a photon with energy E in the rest frame of the particle. Find the frequency
    at which this photon would be detected by the observer.

    I got f=sqrt( (1+(v/c)) / (1-(v/c) ) * (E/h)

    is this correct? the question was 6 marks and all I did was use E=hf and the doppler effect
    Correct, from memory, without calculation. It's also nice to represent \beta = \dfrac{v}{c}
 
 
 
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