Incident photons of energy hν eject electrons of maximum energy K from aluminium of work function W. If incident frequency is doubled, maximum kinetic energy is:
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Question

Incident photons of energy hν eject electrons of maximum energy K from aluminium of work function W. If incident frequency is doubled, maximum kinetic energy is:

G1 Physics · Accepted Answer

Initially Einstein equation gives K = hν − E₀. Doubling light frequency gives K′ = 2hν − E₀. Subtract K′ − K = hν; thus K′ = K + hν, which is exactly option A. Answer: A.