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  • The work function of a substance is . What is the approximate longest wavelength of light that can cause photo-emissio

The work function of a substance is 4 eV. What is the approximate longest wavelength of light that can cause photo-emission ?

Option: 1

309 nm


Option: 2

209 nm


Option: 3

109 nm


Option: 4

9 nm


Answers (1)

best_answer

\begin{aligned} & \lambda_{\mathrm{th}}=\frac{\mathrm{hc}}{\phi}=\frac{12400}{4} \AA=3100 \AA=310 \mathrm{~nm} \\ & \lambda \leq \lambda_{\mathrm{th}} \Rightarrow \lambda \leq 310 \mathrm{~nm} \end{aligned}

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Pankaj

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