Light of wavelength 400 angstorm is incident on a surface for which the threshold wavelength photoelectrons is 5420 angstrom. The work function of sodium is ?
2.29 eV
4.58 eV
1.14 eV
0.57 eV
A
0.57 eV
B
1.14 eV
C
4.58 eV
D
2.29 eV
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Solution
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As we know that
ϕ=12345λ0
ϕ=123455420=2.29eV
Hence, option "B" is correct.
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