(i) A matter pulse is not electromagnetic in behavior.
(ii) Practical observation of matter waves is possible only when the de-Broglie wavelength is of the order of the size of the particles is nature.
(iii)Electron microscope works on the part of de-Broglie waves.
(iv)The medium speed of the matter waves can be larger than the speed of the light.
(v) The number of de-Broglie pulses connected with nth orbital electron is n.
(vi) Only those circular orbits around the nucleus are stable whose circumference is integral multiple of de-Broglie wavelength associated with the orbital electron.