If threshold wavelength for ejection of electron from metal is 660Ao,then work function for the photoelectric emission is

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1.2×10-18J

3×10-11ergs

3×10-18J

Both (2) & (3)

answer is D.

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Detailed Solution

W=hνo=hCλ0=6.6×10-34×3×108660×10-10=3×10-18J=3×10-11ergs

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