Q76 / 90 · JEE Main 2023 (25 Jan Shift 2) · Physics

Given below are two statements :

Statement I : Stopping potential in photoelectric effect does not depend on the power of the light source.

Statement II : For a given metal, the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light.

In the light of above statements, choose the most appropriate answer from the options given below.

  • A
    Statement I is incorrect but statement II is correct
  • B
    Both Statement I and Statement II are incorrect
  • C
    Statement I is correct but statement II is incorrect
  • Correct answer
    D
    Both statement I and statement II are correct

Solution

Stopping potential depends on frequency of incident light and nature of the emitter material. It is independent of the power of the light source.

Maximum kinetic energy of photoelectrons is stated asKEmax=hν-ϕ=hcλ-ϕ, Where, h is the Planck’s constant, ν is the frequency, λ is wavelength of incident light and ϕ is the work function of the metal surface.

Thus, the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light.

So both statements I and II are correct

Hence, the correct answer is option: 'D'.

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