Photoelectric EffectHard
Question
The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is (hc = 1240 eV nm)
Options
A.3.09 eV
B.1.41 eV
C.151 eV
D.1.68 eV
Solution
mv2 = eVo = 1.68eV ⇒ hv 
= 3.1 eV ⇒ 3.1 eV = Wo + 1.6 eV ∴ Wo = 1.42 eV
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