Question

Derive Einstine's photoelectric equation

Answer 1

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Electromagnetic radiation is emitted in quanta and also absorbed in discrete units.

Since electrons are held by attractive forces to the atoms, to escape form a metal, an electron must do a certain amount of work to remove itself from the surface to infinity. An electron in a metal can only escape if it gains enough energy from a single photon to enable it to do the necessary work. So, individual photon must each supply more than a certain amount of energy.

The work function Φ of a material is defined as the minimum amount of the work necessary to remove a free electron from the surface of the material.

Einstein’s photoelectric equation: Ekmax=hf–Φ

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