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A beam of light falls on a metal surface such that photo-electrons are generated. If power of the light source starts to decrease linearly with time t, then variation of the photocurrent I and magnitude of the stopping potential |V| with time is best represented by:
Detailed Solution
$P=\frac{nhc}{\lambda}=nh\nu$. If the power decreases, the number of photons n decreases but the frequency remains the same, since the source is the same. So the photocurrent decreases while the stopping potential remains the same.