Electromagnetic radiation and spectra

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Question

Sodium and Copper have work functions 2.3 eV and 4.6 eV respectively. The minimum wave lengths ratio responsible to knock out electron is nearest to

Moderate

Solution

$\begin{array}{l} w_{0} = \frac{hc}{λ_{0}} \\ \frac{λ_{Na}}{λ_{Cu}} = \frac{w_{Cu}}{w_{Na}} = \frac{4.6}{2 .3} = 2 \end{array}$

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