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How does light stay in motion? Why does it travel at it's speed? Does

  1. Jul 26, 2011 #1
    How does light stay in motion? Why does it travel at it's speed? Does it act as a particle or wave?

    Any links I can read information from will be appreciated !~
     
  2. jcsd
  3. Jul 26, 2011 #2

    ZapperZ

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    Re: Light

    Please start by reading the FAQ subforum in the General Physics section.

    Zz.
     
  4. Jul 26, 2011 #3

    BruceW

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    Re: Light

    wikipedia is good. Search wikipedia. Or google.
    In classical electrodynamics, Maxwell's equations in free space give an electrodynamic wave which travels at c. This is the classical picture.
    In quantum mechanics, light is made up of particles called photons which have zero rest mass and must therefore travel at c. These photons show both wave-like and particle-like properties (as with all quantum objects). In quantum mechanics, its not really correct to say something is a wave or is a particle.
     
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