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

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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 :

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Beyond threshold wavelength current become zero.

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