Question

write an example of matter wave​

Answer 1

It is the wave formed by matter, or in another word, particles. Precisely speaking, every matter formed by particles, or just particles like electrons, have wave-like property, which means they can behave both like particles and waves.

HEY THE ANSWER IS ALSO DAVISSON GERMAN EXPERIMENT.

Answer 2

Matter waves are a central part of the theory of quantum mechanics, being an example of wave–particle duality. All matter exhibits wave-like behavior. For example, a beam of electrons can be diffracted just like a beam of light or a water wave.