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A neutron strikes a hydrogen atom which ...

A neutron strikes a hydrogen atom which is initially at rest and free to move.The initial speed of the neutron is u. After the collision both neutron and the H atom move making `30^0` angle with the initial velocity of the neutron . Also the H atom is found to get excited to first excited state . If the initial K = p times first excitation energy of the atom , find the value of p (assume mass of neutron = mass of H atom).

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