Question

A proton undergoes a head on elastic collision with a particle of unknown mass Initially at rest and rebounds with 16/25 of its initial kinetic energy. Calculate the ratio of the mass of the unknown particle with respect to the mass of the proton.

17 Apr 2025
Answer :
Word Count : 470

In an elastic collision, both momentum and kinetic energy are conserved. We are given that a proton undergoes a head-on elastic collision with a particle of unknown mass initially at rest, and after the collision, the proton rebounds with 16/25 of its initial kinetic energy.

Let the mass of the proton be mpm_p, the mass of the unknown particle be mxm_x, and the initial velocity of the proton be upu_p. Initially, the unknown particle is at rest, so its initial velocity is ux=0u_x = 0.

Conservation of Momentum:

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