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JEE Main 2005 (AIEEE) · Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Photoelectric Experiment: Intensity, Stopping Potential & Graphs question from JEE Main 2005 (AIEEE)

Q78JEE Main 2005 · AIEEEEasy

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

A photocell is illuminated by a small bright source placed $1\ m$ away. When the same source of light is placed $\frac{1}{2}\ m$ away, the number of electrons emitted by photo-cathode would

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Answer: (a)

$I \propto \frac{1}{r^2}$ and number of photoelectrons $\propto I$ .
$r: 1 \to \frac{1}{2}$ m $\Rightarrow I' = 4I$ .
So the answer is (a) increases by a factor of 4.

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