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A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times...

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 6.9×105 m/s.

1) Determine the angle of the neutron, θ′1, after the collision?

θ′1= ???

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

v′n , v′He′ = ???

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