If a surface has a work function 4.0eV, what is the maximum velocity of electrons liberated from the surface when it is irradiated with ultraviolet radiation of wavelength 0.2μm?
A
4.4×105m/s
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B
8.8×107m/s
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C
8.8×105m/s
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D
4.4×107m/s
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Solution
The correct option is C8.8×105m/s Given : ϕ=4eVλ=0.2μm=200nm
Using K.Emax=hcλ−ϕ where K.Emax=12mv2 and hc=1240eV