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Photons and Photoelectric Effect

Question

The threshold wavelength for photoelectric effect of a metal is $$6500\overset {o}{A}$$. The work function of the metal is approximately

A

$$2\ eV$$

B

$$0.1\ eV$$

C

$$1\ eV$$

D

$$3\ eV$$

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Solution

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Correct option is A. $$2\ eV$$
As we knnow,
$$\lambda_0=\dfrac {12375}{6500}=1.9\ eV\approx 2eV$$

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