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NEET 2026 (Re-neet) · Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Photoelectric Experiment: Intensity, Stopping Potential & Graphs question from NEET 2026 (Re-neet)

Q10NEET 2026 · RE-NEETMedium

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

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:

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Answer: (b)

Photocurrent $\propto$ number of photons per second $\propto$ power, so $I$ falls linearly with $t$ .
Stopping potential $e|V| = h\nu - \phi$ depends only on frequency, which is unchanged, so $|V|$ stays constant.
So the answer is (b).

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