If λ0 is the threshold wavelength for photoelectric emission from a metal surface, λ is the wavelength of light falling on the surface of metal and m is the mass of electron, then the maximum speed of

Question

If λ0 is the threshold wavelength for photoelectric emission from a metal surface, λ is the wavelength of light falling on the surface of metal and m is the mass of electron, then the maximum speed of ejected electrons is given by

Prashant Kotian · Accepted Answer

Correct answer: C. K.E._max = 0.5mv² = hc(1/λ - 1/λ0) = hc(λ0-λ)/(λλ0). So v = [2hc/m × (λ0-λ)/(λ0λ)]^1/2.

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