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(A) The photocurrent $I$ is directly proportional to the intensity of the incident light. Since the power of the light source decreases linearly with

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(A) The photocurrent $I$ is directly proportional to the intensity of the incident light. Since the power of the light source decreases linearly with time $t$, the intensity also decreases linearly with time. Therefore, the photocurrent $I$ will decrease linearly with time $t$.
The stopping potential $|V|$ depends only on the frequency of the incident light and the work function of the metal surface, as given by Einstein's photoelectric equation: $eV = h
u - \phi$. Since the frequency $
u$ of the light source remains constant, the stopping potential $|V|$ remains constant over time.
Thus, the graph of $I$ versus $t$ is a straight line with a negative slope, and the graph of $|V|$ versus $t$ is a horizontal straight line. This corresponds to the first option.

$A$ beam of light falls on a metal surface such that photo-electrons are generated. If the power of the light source starts to decrease linearly with time $t$, then the variation of the photocurrent $I$ and the magnitude of the stopping potential $|V|$ with time is best represented by:

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