A nucleus of mass 20 u emits a γ photon of energy 6 MeV. If the emission assume to occur when nucleus is free and rest, then the nucleus will have kinetic energy nearest to (take 1u = 1.6 × 10-27 kg)
1
10 KeV
2
1 KeV
3
0.1 KeV
4
100 KeV
5
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