The surface of a metal is illuminated with the light of 400nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is :
(hc=1240eV.nm)
1.41eV
3.09eV
1.51eV
1.68eV
A
3.09eV
B
1.51eV
C
1.41eV
D
1.68eV
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Solution
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From the photoelectric equation, hcλ=ϕ+( KE )max
1240400=ϕ+1.68
⇒ϕ=1.41eV
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