Question

A monochromatic light beam with a quantum energy value of 4.3 ev is incident upon a photocell. the work function of the photocell is 2.2 ev. what is the maximum kinetic energy of the ejected electrons?

Answer 1

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Answer 2

As per Einstein's Photo electric effect theory

$E = \phi + KE$

the energy which incident in form of photon will be absorbed by the metal surface and some of the energy is released in form of KE of ejected electrons

$E = 4.3 eV$

$\phi = 2.2 eV$

now from the above equation

$E = \phi + KE$

$4.3 = 2.2 + KE$

$KE = 2.1 eV$