First slide

Electromagnetic radiation and spectra

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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