Q.

The photoelectric work function for a metal surface is 4.125 eV. The cut-off  wavelength for this surface is

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a

4125 Ao

b

2065 Ao

c

3000 Ao

d

6000 Ao

answer is C.

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Detailed Solution

WeV=12375λoAo⇒λo=123754.125=3000Ao
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The photoelectric work function for a metal surface is 4.125 eV. The cut-off  wavelength for this surface is