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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