1) If the 3 distance of 100W lamp is increased from a photocell, the saturation current in the photocell varies with the distance d as A) $i \propto d^{2}$ B) $i \propto d$ C) $i \propto \frac{1}{d}$ D) $i \propto \frac{1}{d^{2}}$ Answer: Option DExplanation: As we know, photoelectric current depends on the intensity of incident radiation i.e, $i \propto I$ But, intensity of radiation $I \propto \frac{1}{d^{2}}$ so, $i \propto \frac{1}{d^{2}}$
