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De broglies wavlength and energy

  1. Oct 24, 2009 #1
    I am having a little trouble understanding de Broglies equation and wavelength and it relation ship with energy


    by E=hf and debroglies equation the above equation will get the energy of the particle
    i did an example and i found this energy does not = the Kinetic energy of the particle, infact it was smaller

    why is this

    I thought E = hf only applies to zero mass particles?
  2. jcsd
  3. Oct 24, 2009 #2


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    My understanding is from high school physics (I finished my physics degree 30 some years ago). De Broglie's insight, found while drinking beer in a pub, was that perhaps waves have momentum p = h/λ and particles have wavelength λ = h/p. I don't think E=hf applies to anything other than photons.
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