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Photons and Photoelectric Effect

Question

If the threshold wavelength for sodium is $$5420\overset {o}{A}$$ then the work function of sodium is

A

$$4.58\ eV$$

B

$$1.14\ eV$$

C

$$2.28\ eV$$

D

$$0.23\ eV$$

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Solution

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Correct option is B. $$2.28\ eV$$
As we know,
$$W_0=\dfrac {12375}{\lambda_0}=\dfrac {12375}{5420}=2.28\ eV$$

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