The work function of a substance is12.4 ev . The longest wavelength of light that can cause photoelectron emission from this substance is approximately
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a
540 nm
b
400 nm
c
310 nm
d
100 nm
answer is D.
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Detailed Solution
Work function w=12.4 ev w=hcλ0 λ0=12400w(ev) =1240012.4 =1000A∘ =100 nm