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Math Help - Physics question : Rate of emission and Intensity of incident light

  1. #1
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    Post Physics question : Rate of emission and Intensity of incident light

    So I have a question like this :

    Cesium has a work function of 1.8 eV. When light of wavelength 400 nm falls on the cathode of a photocell of area 1.2 cm^2, only 1 out of every 5 photons succeeded in ejecting an electron. The photoelectric current is 0.25 \mu  A Calculate the :

    (i) Rate of emission of the photoelectrons from the cathode
    (ii) Intensity of the incident light

    I know the formula of intensity of incident light is \frac{N}{t} \frac{hc}{\lambda}  \frac{1}{Area} But i don't know how to apply it here

    Please help me..

    Thankss
    Last edited by Deci; February 6th 2014 at 03:04 AM.
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