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Photon and colour of light

  1. Jun 14, 2006 #1
    i have read that light is made up of photons :rofl: how does similar photons can produce lights of different colours(pardon me if this appears a silly question to u:redface:
  2. jcsd
  3. Jun 14, 2006 #2


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    Staff: Mentor

    The color of a photon depends on its wavelength [itex]\lambda[/itex] or frequency [itex]f[/itex] or energy [itex]E[/itex] (take your pick). They're all related to each other:

    [tex]c = \lambda f[/tex]

    [tex]E = hf[/tex]

    [tex]E = hc / \lambda[/tex]

    where [itex]c[/itex] is the speed of light and [itex]h[/itex] is Planck's constant.
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