A metal surface is illuminated by photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths of emitted radiation is _____.

Q.1 (vii) A metal surface is illuminated by photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths of emitted radiation is _____.

A. 1 : 4

B. 1 : 2

C. 2 : 1

D. 4 : 1

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Answer: B. 1 : 2

Answer: (b) 1 : 2

For a photon \(E = \dfrac{hc}{\lambda}\), so \(\lambda \propto \dfrac{1}{E}\).

\[\frac{\lambda_1}{\lambda_2} = \frac{E_2}{E_1} = \frac{2.5}{5} = \frac{1}{2}\]

The ratio of the wavelengths of the two radiations is 1 : 2.

Doubtly AI · 27 Oct 2026 AI-verified · Oct 2026 Report

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A metal surface is illuminated by photons of energy 5 eV and 2.5 eV respectively. The ratio of their wavelengths of emitted radiation is _____.

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