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Photons and Photoelectric Effect

Question

If threshold wavelength for sodium is $$6800\overset{o}{A}$$ then the work function will be

A

$$1.8\ eV$$

B

$$1.4\ eV$$

C

$$2.5\ eV$$

D

$$2.1\ eV$$

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Solution

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Correct option is A. $$1.8\ eV$$
As we know,
$$W_0=\dfrac {12375}{6800}=1.8\ eV$$

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