Light of incident frequency 2 times the threshold frequency is incident on a photosensitive material. If the…

Light of incident frequency 2 times the threshold frequency is incident on a photosensitive material. If the incident frequency is made $\left(\frac{1}{3}\right)^{\text {rd }}$ and intensity is doubled then the photoelectric current will
  1. decrease.
  2. increase.
  3. be halved.
  4. be zero.

Solution

The final frequency of the light is 2/3 of the threshold frequency and thus, there will be no photoelectric current produced.

Asked in: MHT CET 2020 (15 Oct Shift 2)

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