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`