Q.

What is the threshold wavelength for ejection of electron from metal. If work function for the photoelectric emission  is 4.0ev

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a

310nm

b

6×10-5cm

c

3.1×10-7cm

d

620nm

answer is A.

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Detailed Solution

W=hνo=hCλ0⇒λ0=hCW ⇒λ0=6.6×10-34J×3×108m4×1.6×10-19J=3.1×10-7m=310nm
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What is the threshold wavelength for ejection of electron from metal. If work function for the photoelectric emission  is 4.0ev