Light of frequency two times the threshold frequency is incident on photosensitive material. If the incident frequency is made (1/3) rd and intensity is doubled, then the photoelectric current will (a) increase (b) decrease (c) be zero (d) be halved

Answer: (c). ν = 2ν₀; new frequency ν' = (2ν₀)/(3) < ν₀. Below threshold no emission, regardless of intensity. So the answer is (c) be zero.

Light of frequency two times the threshold frequency is incident on… | MHT CET 2021 (21 Sep, Shift 1)

Q53MHT CET 2021 · 21 SEP · SHIFT 1Medium

Photoelectric Experiment: Intensity, Stopping Potential & Graphs

Light of frequency two times the threshold frequency is incident on photosensitive material. If the incident frequency is made $\left(\frac{1}{3}\right)$ rd and intensity is doubled, then the photoelectric current will

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Answer: (c)

$\nu = 2\nu_0$ ; new frequency $\nu' = \frac{2\nu_0}{3} < \nu_0$ .
Below threshold no emission, regardless of intensity.
So the answer is (c) be zero.

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