A) the electrons present inside the nucleus
B) the electrons produced as a result of the decay of neutrons inside the nucleus
C) the electrons produced as a result of collisions between atoms
D) the electrons orbiting around the nucleus
Correct Answer: B
Solution :
Beta decay can involve the emission of either electrons or positrons. The electrons or positrons emitted in a \[\beta \text{-}\]decay do not exist inside the nucleus. They are only created at the time of emission, just as photons are created when an atom makes a transition from higher to a lower energy state. In negative \[\beta \text{-}\]decay a neutron in the nucleus is transformed into a proton, an electron and an antineutrino. Hence, in radioactive decay process, the negatively charged emitted \[\beta \text{-}\]particles are the electrons produced as a result of the decay of neutrons present inside the nucleus.
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