In the following arrangement `y = 1.0 mm , d = 0.24 mm` and `D = 1.2 m`. The work function of the material of the emitter is `2.

In the following arrangement `y = 1.0 mm , d = 0.24 mm` and `D = 1.2 m`. The work function of the material of the emitter is `2.2 eV`. The stopping potential `V` needed to stop the photo current will be

A. 0.9V
B. 0.5V
C. 0.4V
D. 0.1V

In the following arrangement `y = 1.0 mm , d = 0.24 mm` and `D = 1.2 m`. The work function of the material of the emitter is `2.2 eV`. The stopping po

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