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Does light have momentum? Does light have mass? p=mv

Discussion in 'MCAT Study Question Q&A' started by Gauss44, Sep 6, 2014.

  1. Gauss44

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    Does light have momentum? Does light have mass? p=mv
     
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  3. BreakneckWalrus

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    1. Yes.
    2. No.

    Photons are massless. However, light still does have momentum. p = mv applies to objects not moving at speeds approaching c. You might recall Einstein's E = mc^2. As I understand it, this is a shortened form of the full equation:

    E^2 = (pc)^2 + (mc^2)^2

    In which the ability for light to have momentum is seen even though it has no mass.
     
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  4. justadream

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    p = h / wavelength
     

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