A neutron moving with a speed \( v \) strikes a hydrogen atom in ground state moving towards it ...

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A neutron moving with a speed \( v \) strikes a hydrogen atom in ground state moving towards it with the same speed. If the minimum speed of the neutron for which elastic collision dose not take place is \( 3.13 \times 10^{n} \mathrm{~m} / \mathrm{s} \), then find out the value of \( n \). (The mass of neutron \( = \) mass of hydrogen \( =1.67 \times 10^{-27} \mathrm{~kg} \) )
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