Q.

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

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a

4125A0

b

2062.5A0

c

3000A0

d

6000A0

answer is C.

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Detailed Solution

λ=12400w=124004.125=3000A0
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The photoelectric work function for a metal surface is 4.125eV.   The cut-off wave length for this surface is