6 | P a g e
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.