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Momentum of a photon

  1. Sep 24, 2008 #1
    Can someone please check over my solution and let me know if its right or wrong? Thank you.

    question:calculate the momentum if the energy of photon is 25 x 10^5 erg?

    2500000 Ergs = 0.25 Joules

    (0.25 J)/(3*10^8 m/s)= 8.3*10^-10 J*s/m
  2. jcsd
  3. Sep 24, 2008 #2


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    Re: momentum

    Hi melissajohn,

    That looks right to me.
  4. Sep 25, 2008 #3
    Re: momentum

    ok thanks!... I wasn't sure if the answer was

    = 8.3*10^-10 J*s/m

    or 8.3*10^-10 Newton seconds

    because of the units...
  5. Sep 25, 2008 #4
    Re: momentum

    Newton seconds would probably be a more exact answer, even though it appears to me that that's the same as a Joule * s/m.
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