1. Tardigrade
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  4. Anode voltage of a photocell is kept constant. The wavelength λ of the light falling on the cathode is being slowly modified. The variation of plate current I of the photocell will be ?

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Q. Anode voltage of a photocell is kept constant. The wavelength $\lambda $ of the light falling on the cathode is being slowly modified. The variation of plate current $I$ of the photocell will be ?

NTA AbhyasNTA Abhyas 2020

Solution:

As $\lambda $ is increased, there will be a value of $\lambda $ above which photoelectrons will cease to come out so photocurrent will become zero.
As $\lambda $ is decreased, the photoelectric current again decreases and other phenomenon as pair production starts dominating. Hence this graph is correct