A light source of wavelength  illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV

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🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

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📘Question

A light source of wavelength λ illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV. If the same surface is illuminated by a light source of wavelength λ/2 , then the maximum kinetic energy of ejected electrons will be 

(The work function of metal is 1 eV) 

(1) 2 eV 

(2) 6 eV 

(3) 5 eV 

(4) 3 eV    (JEE-2025)   

✅ Answer

A light source of wavelength λ illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV. If the same surface is illuminated by a light source of wavelength λ/2 , then the maximum kinetic energy of ejected electrons will be  (The work function of metal is 1 eV)  (1) 2 eV  (2) 6 eV  (3) 5 eV  (4) 3 eV   

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