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Q.

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

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a

is one of the orbital electrons

b

is the electron that was previously present in the nucleus

c

is manufactured by the nucleus out of the available energy

d

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