Question

difference between matter waves nd electromagnetic waves

Answer 1

1 speed of electromagnetic wave is more than speed of matter wave
2 electromagnetic wave can be radiated in empty space while matter wave can't
3 matter wave have smaller wavelength than electromagnetic wave

Answer 2

There are many differences because of this: A 'matter wave' is (unavoidably) complex valued, unlike a light wave, where the electric and magnetic fields are always real valued. ... (In addition to John Rennie's point - the phase velocity of a matter wave is half its group velocity, while they are the same for light).