A metal surface in an evacuated tube is illuminated with monochromatic light causing the emission of photoelectrons. For a given intensity of light, a graph between saturation current and potential of the electrode is given in Fig. If the experiment were repeated with light of twice the intensity but the same wavelength, which of the graphs below would best represent the new relation between I and V?(Dotted represents initial condition)

Options

A.
B.
C.
D.

Answer

B

Explanation

On increaseng intensity, only saturation current increases, whereas retarding potential remains the same because wavelength of lighti s unchanged.