Law Of The Photoelectric Emission And Einstein’s Explanation
Law Of Photoelectric Emission:
Einstein Photoelectric Equation:
Einstein used Plank’s Quantum Theory to explain the laws of the photoelectric effect. According to the Einstein light radiations are made up of photons. And the each of the photon is required to eject the electrons from the surface of the metal. The total energy of the photon is used in to two ways first to eject the electrons from the surface of the metal and secondly to provide the kinetic energy to the ejected electrons.
If the w is the work done and μo threshold frequency then W = h μo
According to the Einstein
h μ = h μo + ½ m V 2max
½ m V 2max = h μ - h μo
Statements Of Albert Einstein For the Explanation Of The Laws Of Photoelectric Effect:
1) According to the Albert Einstein For a given metal and frequency when the frequency of the incident radiations increased the number of the photons falling per unit in the surface of the metal increases as one photon is required to eject the one electron. So, therefore the number of the photoelectrons ejected from the surface of the metal increases and Hence the photoelectric Current increases.
2) If μo < μ
Then the value of the photoelectric current will be Negative Which Can’t be possible. So, Einstein Gives Another Law for his explanation i.e.
So, Therefore applied Frequency should be greater then the threshold frequency in order to cause the Photoelectric Emission.
3) h μo is Constant for a given metal
½ m V 2 = h μ
Where the kinetic energy is directly proportional to the the μ
4) The photoelectric is an outcome of the elastic collision between the photons and the electrons Whole of the energy is transfer to the electrons directly as the process of the elastic collision which is very fast, So, therefore there is not any time lack between the incident radiations and the photoelectric emission of the electrons from the surface of the metal.
So, these are the statements which are given the Albert Einstein For the Explanation of the Photoelectric Emission.