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Radiation in darkness

  1. Oct 29, 2015 #1
    Light consists of photon
    Photon is carrier of energy
    When lights are switched off where had the energy of photon gone
    According to law of conservation of energy
    Energy can't be destroyed
    In darkness, are they any radiation due to conversion of energy??
     
  2. jcsd
  3. Oct 29, 2015 #2

    DaveC426913

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    Gold Member

    The visible light is absorbed by the walls, heating them up. Often the energy is re-emitted in the infra-red.
     
  4. Oct 29, 2015 #3

    Drakkith

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    Staff: Mentor

    As Dave said, the energy of the photons already created and in flight when the light is switched off are absorbed by the walls and anything else in line-of-sight of the bulb. After that, well, no more photons are being generated from the light source.
     
  5. Oct 30, 2015 #4
    Photon contains energy ,an energy cant be destroyed or if they are absorbed by walls do they posses any energy or reemit as infra red radiation
     
  6. Oct 30, 2015 #5

    Drakkith

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    Staff: Mentor

    The photon no longer exists after absorption. The energy it contained is completely transferred to the wall, so no energy is lost.
     
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