First slide

Photo Electric Effect

Question

The work functions for sodium and copper are 2 eV and 4 eV. Which of them is suitable for a photocell with 400 nm light?

Moderate

Solution

$\begin{array}{l} Threshold wavelength for Na and Cu \\ λ_{Na} = \frac{12400}{2} = 6200 \overset{0}{A} \\ λ_{Cu} = \frac{12400}{4} = 3100 \overset{0}{A} \\ Na needs lesser energy than 4000 \overset{0}{A} \end{array}$

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