The threshold wavelength for a metal with work function W0 is λ0. What is the threshold wavelength for a metal whose work function is W02?
A
λ04
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B
λ02
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C
2λ0
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D
4λ0
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Solution
The correct option is C2λ0 For a metal of work function W0, W0=hcλ0 Now, for a metal of work function W02, W02=hcλ ⇒hc2λ0=hcλ⇒λ=2λ0 Hence, the correct choice is (c).