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Maximum photocurrent ejected by electrons in photoelectric effect

  1. Jun 13, 2009 #1
    Does anyone know how to determine the maximum photocurrent that could be produced by ejected electrons in a photoelectric effect experiment_(as unpolarized beam of light incidents on a metal surface)?
    I don't know of any formula that calculates the photocurrent and I could not derive any. I was given Power as 28.0mW; frequency of the beam is 7.4* 10^14Hz; and stopping potential Vs as 1.45V.
    - I calculated the wavelength of the beam of light as 405nm.(c/f);
    - Energy in the photon as 3.06eV. (hf)
    -Max speed of the electrons ejected as 7.1*10^5m/s. [sqrt(2K.E_max/mass)]
    -Work function as 1.61eV. (E_photon - KE_max)

    But I am not able to figure out a formula for determining the photocurrent.
  2. jcsd
  3. Jun 13, 2009 #2
    I have found the magic formula from someone. It's power divided by the Energy of the photon, and then multiplying that answer by e(charge of an electron). I ended up getting 9.1mA.
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