A ray of light with wavelength λ is incident on three different photoelectric cells namely 1, 2 and 3. The threshold wavelength of these photoelectric cells are λ₁, λ₂, and λ₃, respectively and the magnitude of stopping potentials of these cells are V₁, V₂ and V₃, respectively. The relation between λ and threshold wavelengths are λ₁ λ and λ₃ ≫ λ. The correct option is:

Question

A ray of light with wavelength λ is incident on three different photoelectric cells namely 1, 2 and 3. The threshold wavelength of these photoelectric cells are λ₁, λ₂, and λ₃, respectively and the magnitude of stopping potentials of these cells are V₁, V₂ and V₃, respectively. The relation between λ and threshold wavelengths are λ₁ < λ, λ₂ > λ and λ₃ ≫ λ. The correct option is:

Dr. Abubacker · Accepted Answer

[Solution from source] Emission occurs only if λ is shorter than the threshold wavelength. For cell 1 (λ₁ < λ) there is no emission, so V₁ = 0. $eV=hc/\lambda-hc/\lambda_0$ grows as the threshold λ₀ increases, so V₃ (λ₃ ≫ λ) exceeds V₂. Answer (2).

Explanation

Reviewed by Dr. Abubacker

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