A neutron moving with a speed '' makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which inelastic collision will take place is :
← JEE Main 2016 · 10 Apr · Shift 1
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JEE Main 2016 · 10 Apr · Shift 1, Physics question 22
Answer and worked solution
Official answer: D
For equal masses, at most half the kinetic energy can be converted in a head-on collision (the rest stays as centre-of-mass motion). Exciting hydrogen needs 10.2 eV, so the neutron needs at least 20.4 eV.