If the threshold wavelength (λ0) for the ejection of an electron from a metal is 110 nm, then the work function for the photoelectric emission is:
(Planck's constant (h) = 6.6×10−341.8×10−18J s)
A
1.2×10−18J
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B
6×10−19J
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C
1.8×10−19J
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D
1.8×10−18J
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Solution
The correct option is D1.8×10−18J From Einstein's photoelectric effect, the 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/s110×10−9m=1.8×10−18J