Physics Help Forum maximum photocurrent ejected by electrons in photoelectric effect

 Nuclear and Particle Physics Nuclear and Particle Physics Help Forum

 Jun 13th 2009, 10:39 AM #1 Junior Member   Join Date: May 2009 Posts: 6 maximum photocurrent ejected by electrons in photoelectric effect In a photoelectric effect experiment, unpolarized beam of light is incident on a metal surface. Power is given as 28.0mW; frequency of the beam is 7.4* 10^14Hz; and stopping potential Vs as 1.45V. -I was able to find 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'm stuck now. I am also supposed to determine the maximum photocurrent that could be produced by the ejected electrons; but I don't have any formula that calculates the photocurrent and I could not derive any. Could anyone help please? Thanks. Last edited by mola; Jun 13th 2009 at 10:47 AM.
 Jun 13th 2009, 12:07 PM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 If you divide the power by the energy of the photon, you should get the no of electrons emitted per sec as there is a one is to one photon- electron correspondence. Multiply the no of electrons per sec with the charge of the electron to get the max photo current which is when the stopping potential is made zero. Be careful of units electron volts , watts etc.

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