Modern Physics 2 Question 32

31. In a photoelectric experiment set-up, photons of energy 5eV falls on the cathode having work function 3eV. (a) If the saturation current is iA=4μA for intensity 105W/m2, then plot a graph between anode potential and current. (b) Also, draw a graph for intensity of incident radiation 2×105W/m2.

(2003,2M)

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Solution:

  1. Maximum kinetic energy of the photoelectrons would be

Therefore, the stopping potential is 2V. Saturation current depends on the intensity of light incident. When the intensity is doubled the saturation current will also become two fold. The corresponding graphs are shown in above figure.



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