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 :

Step-by-step solution

The power of the incident light is P = n h , where n is the number of photons incident per unit time and is the frequency. As the power decreases linearly with time, the number of incident photons n also decreases linearly, assuming the frequency remains constant. The photocurrent I is directly proportional to the number of incident photons per unit time ( I n ). Thus, the photocurrent I decreases linearly with time. The stopping potential V is given by Einstein's photoelectric equation e|V| = h - , where is the wo