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Photons Emitted by the Sun

  1. Oct 7, 2009 #1
    1. The problem statement, all variables and given/known data
    The sun emits 3x1032J of energy every day. Assume it emits only yellow light (6x10-7m wavelength. a. What is the energy of each photon of yellow light? b. How many photons does the sun emit every day?


    2. Relevant equations

    E = hf

    3. The attempt at a solution
    So I think I have question A complete, my solution is the following.
    F = (3x108 m/s)/(6x10-7 m) = 5x1014 Hz
    H = (6.6x10-34Js)
    E=h*f (6.6x10-34Js)(5x1014Hz) = 3.3x10-19 J
    Or E = 2 eV

    But problem B I am stumped. I don't even know where to begin to figure this out. Can anyone help put me in the right direction?
     
  2. jcsd
  3. Oct 7, 2009 #2

    lewando

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    Gold Member

    You computed the energy of a single photon in J. You have the total energy output of the sun (n photons) in a day also in J. You seem pretty close to an answer.
     
  4. Oct 10, 2009 #3
    So the answer is 9.9x1013 photons?
     
  5. Oct 10, 2009 #4

    Redbelly98

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    Staff Emeritus
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    Homework Helper

    If you multiply 3x1032J and 3.3x10-19 J/photon, the result is 9.9x10^13 J2/photon.

    Those units, J2/photon, do not make any sense. So no, that is not it.

    Since the question asks for the number of photons, you're looking for an answer with units of "photons" in it.
     
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