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Homework Help: Photoelectric Effect.

  1. May 10, 2008 #1
    How many photons per second are emitted by a monochromatic light bulb (650nm) that emits 25 W of power?


    hf=Ek + W


    is there a way we can find power? how do I solve this question?
  2. jcsd
  3. May 10, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: What's the energy of a single 650nm photon? (This is not a photoelectric effect problem.)
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