The work functions for sodium and copper are 2eV and 4eV. Which of them is suitable for a photocell with $4000 \circ A$ light

Copper

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Sodium

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Both

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Neither of them

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Solution

The correct option is B
Sodium

Threshold wavelength for Na, $λ_{N a} = \frac{12375}{2} = 6187.5 \circ A$
$A l s o λ_{C u} = \frac{12375}{4} = 3093.75$
$S i n c e λ_{N a} > 4000 \circ A;$ So Na is suitable.

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