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Archived Planck's law and doppler effect

  1. May 4, 2013 #1
    Hello, We proved something during the course but I totally forgot how to do it..
    1. The problem statement, all variables and given/known data
    Prove that Planck's Law E=h*u is deduced from the equation of Doppler effect u'=u*√((1-β)/(1+β))
    2. Relevant equations
    Lorentz transformation

    3. The attempt at a solution
    If we take a beam of light of frequency u and an observer with speed Bc
    I don't know if it's correct..
    And px*c=E so
    E/u=cste=h ?
    Last edited: May 5, 2013
  2. jcsd
  3. Jul 3, 2016 #2

    James R

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    I don't think that the energy of a photon can be derived solely from a consideration of the Doppler effect (relativistic or not). More information is needed.
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