During a negative beta decay, 

(a) an atomic electron is ejected 

(b) an electron which is already present within the nucleus is ejected 

(c) a neutron in the nucleus decays emitting an electron

(d) a proton in the nucleus decays emitting an electron.

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2 Answers

(c) a neutron in the nucleus decays emitting an electron

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The Correct option is (C) a neutron in the nucleus decays emitted an electron 

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