Light of energy 4.7 1019 j is irradiated on a metal surface having work function equal to 2.02 ev. The kinetic energy of the emitted photoelectrons is
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1 eV = 1.6 * 10E-19 J (charge of electron * 1 V)
2.02 eV = 2.02 * 1.6 * 10E-19 J = 3.23 J
h f = 4.7 * 10E-19 J energy of incident light
(4.7 - 3.23) * 10E-19 J = 1.5 * 10E-19 J the KE of the phoelectrons
where KE = h f - Wf where Wf is the work function
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