Explanation
If electron oscillates with a frequency of 1 GHz, it does nor radiate any energy which corresponds a definite wavelength. It only radiates when it jumps from one orbit to another orbit.
Positive rays were discovered by Goldstein.
G.P. Thomson experimentally confirmed the existence of matter waves (de-Broglie’s hypothesis) by demonstrating that electron beams are diffracted when they arc scattered by the regular atomic arryas of crystals.
Wave nature of matter of de-Broglie was proved when accelerated electrons showed diffraction by metal foil in the same manner as X-ray diffraction.
Davission and Germer proved the wave nature of electron by performing an experiment.
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