First slide

The steps in collision

Question

A neutron moving with a speed v collides head on with a stationary $α$ -particle. The speed of the neutron after collision is

Moderate

A

v/4
B

3 v /5
C

3 v /4
D

v/5

Solution

Given mass of neutron = m
m Mass of o-particle = 4 m
Here, we have the velocity of neutron after collision
$v_{1} = (\frac{m_{1} - m_{2}}{m_{1} + m_{2}}) v = (\frac{m - 4 m}{m + 4 m}) u = - \frac{3}{5} v Negative si g n i n d i c a t e s t h a t the n e u t r o n w i l l m o v e i n opposite direc t i on$

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