If the threshold wavelength (λ0) for ejection of electron from metal is 330 nm, then work function for the photoelectric emission is:
(Planck's constant (h) = 6.6×10−34J s)
A
1.2×10−18J
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B
1.2×10−20J
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C
6×10−19J
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D
6×10−12J
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Solution
The correct option is C6×10−19J From the Einstein photoelectric effect, work function is the minimum energy required to remove an electron from the metal surface.
Work function = Threshold energy ⟹hν0=hcλ0=6.6×10−34J s×3×108m/s330×10−9m=6×10−19J