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De Broglie hypothesis

  1. May 16, 2005 #1
    :grumpy: some help with this past exam question would be appriciated....

    "Calculate the value of the kinetic energy in eV at which the de Broglie wavelength of a photon is comparable with the size of an atom (~10^-10 m)"


    Thanks...
     
  2. jcsd
  3. May 16, 2005 #2

    Doc Al

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    Staff: Mentor

    The energy of a photon is given by [itex]E = h \nu[/itex].
     
  4. May 17, 2005 #3
    We use [itex]E = hf[/itex] in most UK schools, Doc Al, not [itex]E = h \nu[/itex]
    (I don't know why we use different symbols for the same thing... it can cause confusion!)
     
  5. May 17, 2005 #4

    dextercioby

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    Please,post future problems in the Homework Section of this forum.

    Daniel.
     
  6. May 17, 2005 #5
    I hate the second form of expressing the energy of a photon (E=hv). Because the "v" can't really be differed from the velocity, ... (the signs are almost the same).
     
  7. May 17, 2005 #6

    Doc Al

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    Staff: Mentor

    I'll have to keep that in mind. :smile:
     
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