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NEET 2020 (Phase 1) · Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Photoelectric Experiment: Intensity, Stopping Potential & Graphs question from NEET 2020 (Phase 1)

Q57NEET 2020 · PHASE 1Medium

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

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Answer: (c)

$\nu = 1.5\nu_0$ ; halved: $\nu' = 0.75\nu_0 < \nu_0$ .
Below threshold no photoelectrons, whatever the intensity.
So the answer is (c) zero.

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