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Threshold wavelength for a metal with work function 3 eV:

AAbout 413 nm (= 1240/3)
B100 nm
C1240 nm
D700 nm
Answer & Solution
Correct answer: A. About 413 nm (= 1240/3)
We have λ₀ = hc/φ. So λ₀ = 1240/3 ≈ 413 nm. Below this wavelength (= higher frequency) photoemission occurs.
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