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The de Broglie wavelength ( λ ) associated with a photoelectron varies with the frequency (v) of the incident radiation as, [v 0 is threshold frequency] :

1. λ ∞ 2 3 0 ) v v ( 1 −
2. λ ∞ 4 1 0 ) v v ( 1 −
3. λ ∞ ) v v ( 1 0 −
4. λ ∞ 2 1 0 ) v v ( 1 −

Correct answer: λ ∞ 2 1 0 ) v v ( 1 −

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