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Tranform photon to other energy

  1. May 16, 2012 #1
    hi guys i wanna ask you about something . Energy can not be made or destruct , but it can TRANSFORM to other energy . my question is can photon transform to other energy ? :zzz:
     
  2. jcsd
  3. May 16, 2012 #2

    russ_watters

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    Sure: Whenever it hits something and is absorbed.
     
  4. May 17, 2012 #3
    russ : how about the light ? if light hits something , will it absorbed ?
     
  5. May 17, 2012 #4

    Doc Al

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    Isn't that the same question? Light is photons, after all.
     
  6. May 17, 2012 #5
    what will be if photon of light destruct ?
     
  7. May 17, 2012 #6

    Doc Al

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    Increased internal energy. Consider what happens when you sit out in the sun: you get hot.
     
  8. May 17, 2012 #7

    Drakkith

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  9. May 17, 2012 #8
    Here is an extreme case of photon energy transformation. Shoot a laser beam of 1-eV photons headlong into a 1-GeV electron beam (γ=1960). The photon Compton scatters off the electron and back along the same direction as the incident electron. The energy of the backscattered photon is 4γ2·1 eV = 15 MeV.
     
  10. May 18, 2012 #9
    i just think if photon is neutral , it can not be affected by electron , i guess
     
  11. May 18, 2012 #10

    Drakkith

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    Photons easily interact with charged particles including electrons.
     
  12. May 18, 2012 #11
    can you explain why this happen , i just think if neutral charged can not be affected by positive charge or negative one
     
  13. May 18, 2012 #12
    The photon is comprised of a transverse E field and an orthogonal transverse H field. It is the transverse E field that interacts with charged particles. At very low energies photons interact with the entire atom, like in Rayleigh scattering of sunlight (blue sky). At higher energies, photons interact with individual electrons, and this is called Thomson scattering. See http://en.wikipedia.org/wiki/Thomson_scattering. At relativistic energies, it is called Compton scattering.

    The cross ection for Thomson scattering is about 0.665 barns = 0.665 x 10-24 cm2.

    .
     
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