De Broglie Waves

The ratio of velocities of a proton and an alpha particle is 4 : 1. The ratio of their De Broglie wave lengths will be

Velocity of de Broglie wave is given by :

Why is de Broglie wave termed as matter wave?

What is de Broglie wave length? Give the de Broglie equation.

The de Broglie wave present in fifth Bohr orbit is:

De-Broglie wave are associated with a moving particle irrespective of.............on it.

What are matter waves? Derive an expression for the de Broglie wave length.