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(A) In the photoelectric effect,the photoelectric current $I$ is directly proportional to the intensity of the incident light,provided the frequency $

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(A) In the photoelectric effect,the photoelectric current $I$ is directly proportional to the intensity of the incident light,provided the frequency $
u$ of the incident light is greater than the threshold frequency $
u_0$.If the intensity of the incident light is kept constant while the frequency $
u$ is increased,the number of photons incident per unit time remains constant (since $P = n h 
u$,if power $P$ is constant,$n$ decreases as $
u$ increases). However,in practical experimental setups,the photoelectric current is independent of the frequency of light as long as $
u > 
u_0$.Therefore,the graph of photoelectric current $I$ versus frequency $
u$ is a horizontal line for $
u > 
u_0$ and zero for $
u < 
u_0$. This corresponds to the graph shown in option $A$.

The anode voltage of a photocell is kept fixed. The frequency of the light falling on the cathode is gradually increased. Then the correct graph which shows the variation of photo current $I$ with the frequency $\nu$ of incident light is

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