MHT CET 2025 Physics question
When a metal surface is illuminated by light of wavelength and , the maximum velocities of photoelectrons ejected are V and 2V respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light, )
Answer: (D)
Solution
Einstein's equation: . Let . Since the speed doubles, the kinetic energy becomes . So ... (i) and ... (ii). Multiply (i) by 4 and subtract (ii): $
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