If the distance of 100 W lamp is increased from a photocell, the saturation current i in the photocell varies with the distance d as

Question

If the distance of 100 W lamp is increased from a photocell, the saturation current i in the photocell varies with the distance d as (A) i propto d2 (B) i propto d (C) i propto (1/d)  (D) i propto (1/d2)

Tardigrade Admin · Accepted Answer

As we know, Photoelectric current depends on the intensity of incident radiation i.e., i propto I But, intensity of radiation I propto (1/d2 ) i propto (1/d2)

Q. If the distance of $100 W$ lamp is increased from a photocell, the saturation current $i$ in the photocell varies with the distance $d$ as

$i \propto d^{2}$

$i \propto d$

$i \propto \frac{1}{d}$

$i \propto \frac{1}{d ^{2}}$

As we know, Photoelectric current depends on the intensity of incident radiation i.e., $i \propto I$
But, intensity of radiation $I \propto \frac{1}{d ^{2}}$
$i \propto \frac{1}{d ^{2}}$

Q. If the distance of 100W lamp is increased from a photocell, the saturation current i in the photocell varies with the distance d as

i∝d2

i∝d

i∝d1​

i∝d21​