Question

A nucleus is at rest in the laboratory view from the reference show that if it disintegrates into two smaller nucleus the product must move in the opposite direction ​

Answer 1

may this answer will help you.....

Answer 2

Let m masses of the parent nucleus and m1 and m2 be the respective two daughter nuclei. The parent nucleus is at rest.Initial momentum of the system (parent nucleus) = 0

Let v1 and v2 be the respective velocities of the daughter nuclei having masses m1

and m2.

According to the law of conservation of momentum:

Total initial momentum = Total final momentum

0 = m1v1 + m2v2

v1 = −m2v2 / m1

Here, the negative sign indicates that the fragments of the parent nucleus move in directions opposite to each other.