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Nuclear fusion in stars requires which special condition that ordinary fission does not?
AOrdinary room temperature and normal pressure
BA graphite neutron-absorbing moderator block
CA subcritical mass of natural uranium
DExtremely high temperature and high pressure
Answer & Solution
Correct answer: D. Extremely high temperature and high pressure
1. Fusing nuclei are both positive and repel each other electrically.
2. Overcoming this repulsion needs extremely high temperature (10^7 to 10^9 K) and pressure.
3. Hence fusion is called a thermonuclear reaction.
4. Fission, by contrast, can proceed at ordinary temperature.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 6 Nuclear Physics "Nuclear Physics", p.88_
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