alleryWhat is the phenomenon of spontaneous emission of radiation from certain heavy elements, without any external cause, called?
ANuclear fusion
BArtificial radioactivity
CNatural radioactivity
DChemical ionisation
Answer & Solution
Correct answer: C. Natural radioactivity
1. Some heavy nuclei are unstable and decay on their own.
2. The spontaneous emission of radiation from such elements is natural radioactivity.
3. Artificial radioactivity needs external bombardment, so it is induced, not spontaneous.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 6 Nuclear Physics "Nuclear Physics", p.82_
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