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where , m = mass of electron , e = electronic charge and V = potential difference with which electron is accelerated .
Davisson and Germer proves the existence of de-Broglie waves associated with an electron in motion .
Davisson-Germer Experiment
The wave nature of the material particles as predicted by de-Broglie was confirmed by Davisson and Germer ( 1927 ) in united states and by GP Thomson ( 1928 ) in scotland .
This experiment verified the wave nature of electron using Ni crystal .
Davisson and Germer found that the intensity of scattered beam of electrons was not the same but different at different angles of scattering . It is maximum for diffracting angle 50 ° at 54 V potential difference .
X-rays
When cathode rays strike on a heavy metal of high melting point . then a very small fraction of its energy converts in to a new type of waves , called X-rays .
Properties of X-rays X-rays were discovered by Roentgen .