University:
North Idaho College
Course:
PHYS-211 | Engineering Physics I
Academic year:

2023
Views:

195

Pages:

3
Author:

Hani T.

Einstein's Theory. Einstein applied the quantum theory of light to explain the photo electric effect. It was recognised by him that light of any frequency will not cause photo electric effect. There is a certain minimum frequency of light Called threshold frequency, that is required to cause ejection of electrons, each metar has adiffert threshold frequency if a light of frequency hv is allowed to strike a metal it imparts an energy hv。 to the metal (where v。 is the threshold freq) The extra energy is imparted to the ejected electron as kinetic energy. hv = hv。 + ½ mv² This indicates that there exists a characteristic property of the metal which is linked to the binding energy of the electrons. in the metal. The work function of a metal (Φmetal) is defined as the minimum energy required to remove an electron from the Bulk of a Material The Work function Φmetal = hv