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Question

In an experiment on photoelectric effect, Light of wavelength 800 nm (less than threshold wavelength) is incident on a cesium plate at the rate of 5.0 W. The potential of the collector plate is made sufficiently positive with respect on the emitter so that the current reaches its saturation value. Assuming that on the average one of every 106 photons is able to eject a photoelectron, find the photo current in the circuit.

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Solution

λ=800nmP=5WE of photon=hcλ=1242400ev
no. of photon = 5×8001.6×1019×1242
No. of electrons = 1 per 106 photon
no. of photoelectron emitted =5×8001.6×1242×1019×106
photo electric current = 5×8001.6×1242×1019×106×1.6×1019
photo electric current =3.2μA

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