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The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

Options

(a) 5380 Å
(b) 2900 Å
(c) 2500 Å
(d) 2000 Å

Correct Answer:

5380 Å

Explanation:

Work function = W₀

Wavelength = λ₀ = 12375 eV Å/ 2.3 eV = 5380 Å

Therefore, λ₀ = 5380 Å

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