Threshold wavelength for photoelectric effect on sodium is $$5000$$ Ao. The work function (in$$ x $$10-19$$ $$J) is $$_______$$.

$$W0=hc$$λ$$0=6.625$$×$$10$$−$$34$$×$$3$$×$$1085000$$×$$10$$−$$10J=4$$×$$10$$−$$19J$$

Photoelectric effect and study of photoelectric effect

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Question

Threshold wavelength for photoelectric effect on sodium is 5000 $\overset{o}{A}$ . The work function (in x 10^-19 J) is _______.

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Solution

$W_{0} = \frac{h c}{λ_{0}} = \frac{6.625 \times 10^{- 34} \times 3 \times 10^{8}}{5000 \times 10^{- 10}} J = 4 \times 10^{- 19} J$

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