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Q.

If the threshold wavelength for sodium is 5420 Ao, then the work function of sodium is

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a

4.58 eV

b

2.28 eV

c

1.14 eV

d

0.23 eV

answer is B.

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Detailed Solution

Wo=12375λo=123755420=2.28eV
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If the threshold wavelength for sodium is 5420 Ao, then the work function of sodium is