An a particle and a free electron both initially at rest combine to form a Het ion in its ground state with the emission of a

Question

An a particle and a free electron both initially at rest combine to form a Het ion in its ground state with the emission of a single photon the energy of the photon is A 54 4 eV B 27 2 eV C 13 6 eV D 40 8 eV

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