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in Physics by (50.2k points)

When a monochromatic source of light is at a distance of 0.2m from a photoelectric cell, the cut-off voltage and the saturation current are respectively 0.6 V and 18 m A. If the same source is placed 0.6 m a way from the cell, then :

(A) the stopping potential will be 0.2V

(B) the stopping potential will be 1.8V

(C) the saturation current will be 6.0mA

(D) the saturation current will be 2.0mA

1 Answer

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Best answer

Correct Answer is: (D) the saturation current will be 2.0mA

When the source is 3 times farther, number of photons falling on the surface becomes 1/9th but the frequency remains same.Hence stopping potential will be same i.e. 0.6V and saturation current become 1/9 x 1/ mA= 2mA,

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