G.P Thomson experimentally confirmed the...

G.P Thomson experimentally confirmed the existence of matter waves by the phenomena

diffraction

refraction

polarization

scattering

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G.P. Thomson experimentally confirmed the existence of matter waves (de Broglie.s hypothesis) by demonstrating that electron beams are diffracted when they are scattered by the regular atomic arrays of crystals.

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Matter waves are

Transverse waves

Longitudinal waves

de Broglie wave

Electromagnetic waves

Matter waves are:

electromagnetic waves

mechanical waves

either mechanical or electromagnetic waves

neither mechanical nor electromagnetic waves