JEE Advanced Model Paper 5 with solutions for online practice

A moving neutron strikes a stationary H-atom. After the collision, velocities of both neutron and the H-atom makean angle of 30° with the initial direction of motion of neutron. Also, the H-atom is found to get excited to firstexcited state. The initial kinetic energy of neutron is p times first excitation energy of H-atom. Find the valueof p. [Assume mass of neutron = mass of H - atom]