A nucleus of mass 20 u emits a gamma-pho...

A nucleus of mass 20 u emits a `gamma`-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 xx 10^(-27)` kg)

10 keV

1 keV

0.1 keV

100 keV

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