Ejection of the photoelectron from metal in the photoelectric effect experiment can be stopped by applying 0.5V when the radiation of 250nm is used. The work function of the metal is:
5eV
5.5eV
4.5eV
4eV
A
4eV
B
5eV
C
4.5eV
D
5.5eV
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Solution
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From Ejection photoelectron
∵hv=hvo+K.E.
hvx=ϕ+Stopping pot
∴ϕ=hcx−S.P.
=6.6×10−34×3×108250×10−9×1.6×10−19−0.5×1.6×10−10
=6.6×3250×1.6×102−0.5
=4.95−0.5
∼4.5eV
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