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 4000 A light?

Easy

A

Copper
B

Sodium
C

Both
D

None of these

Solution

Threshold wavelength for Na,
$\begin{array}{l} λ_{Na} = \frac{12375}{2} = 6187 .5 \overset{o}{A} \\ Also λ_{Cu} = \frac{12375}{4} = 3093 .75 \\ Since λ_{Na} > 4000 \overset{o}{A}; So Na is suitable . \end{array}$

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