The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is…

The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows :

Solution

As λ is increased, there will be a value of λ above which photo-electron will be cease to come out, so photo-current will becomes zero.

Asked in: JEE Main 2013 (07 Apr)

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