In the nuclear reaction ZAX→Z−1AY+β−+r¯+Energy, the emitted electron

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is one of the orbital electrons

is the electron that was previously present in the nucleus

is manufactured by the nucleus out of the available energy

None of the above is correct

answer is C.

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Detailed Solution

No electron of the observed energies can exist inside the nucleus which violates uncertainty principle. This electron is manufactured by the nucleus of ZAX out of the available energy. For this to happen, the rest mass energy difference between ZAX and Z−1AY should at least be mec2

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