https://www.youtube.com/watch?v=bIxqgEjj2dc
plus this great write up on what a group wave is... for de Broglie
https://www.dacollege.org/smat/physics-IV-SEM-CC-9-5.pdf
Equation (5.33) shows that phase velocity is a function of wavelength even in free space. So unlike light waves, the de Broglie waves would show dispersion even in vacuum. This is the difference between de Broglie waves and light waves.
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