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Q.

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?

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a

Copper

b

Sodium

c

Both

d

None of these

answer is B.

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Detailed Solution

Threshold wavelength for Na,λNa=123752=6187.5AoAlso  λCu=123754=3093.75Since  λNa>4000Ao;   So  Na  is  suitable.
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