A Neutron moving with velocity v collides with a stationary `alpha` particle. The velocity of the neutron after collision is

Alpha particle is….times heavier than neutron:

What is the resultant velocity of a stationary wave ?

A steel ball of mass m is initially at rest on a horizontal frictionless surface. It is struck head on by another steel ball of mass 2m travelling with a velocity of 50 cm/s. Calculate the velocities of the two balls after a collision assuming it to be elastic.

What is particle velocity and wave velocity? Distinguish them.

Derive a relation between particle velocity and wave velocity.