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  • The threshold frequency for photo electric effect on sodium corresponds to a wavelength  . Its work function is<div class='qna-option

The threshold frequency for photo electric effect on sodium corresponds to a wavelength 5000 \AA . Its work function is

Option: 1

15 Joule


Option: 2

10 \times 10^{-19} Joule


Option: 3

4 \times 10^{-19} Joule


Option: 4

None of these


Answers (1)

best_answer

\begin{aligned} & \phi=\frac{\mathrm{hc}}{\lambda_0} \\ & \phi=\frac{20 \times 10^{-26}}{5000 \times 10^{-10}}=4 \times 10^{-19} \mathrm{Joule} \end{aligned}

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Rishabh

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