First slide

Photo Electric Effect

Question

The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be

Easy

Solution

Work function
$\begin{array}{l} W_{0} = h ν_{0} \\ ν_{0} = \frac{W_{0}}{h} = \frac{1 .65 \times 1 .6 \times 10^{- 19}}{6 .6 \times 10^{- 34}} = 4 \times 10^{14} H z \end{array}$

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