Question

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to move off at an angle θ′2=45∘. The neutron's initial speed is 3.2×10⁵ m/s

Determine the angle of the neutron, θ′1, after the collision. ( it is not 53 degree )

Determine the speeds of the two particles, v′n and v′He, after the collision   

Answer 1