MCQ
In β- emission from a radioactive substance, an electron is ejected. This electron comes from:
- AThe outermost orbit of an atom
- BThe inner orbits of an atom
- CThe surface of substance
- ✓The nucleus of an atom
Hint: Radioactivity is a nuclear phenomenon. Hence, electrons come out from the nucleus. Electron is created as a result of decay of one neutron into a proton inside the nucleus and it is not possible for the electron to stay inside the nucleus; thus, it is spontaneously emitted.
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