Nuclear fusion, the Sun's energy source, most commonly fuses hydrogen isotopes into:
ACarbon
BOxygen
CHelium
DLithium
Answer & Solution
Correct answer: C. Helium
1. Lighter nuclei join into a heavier one.
2. Hydrogen fuses into helium.
3. Extreme temperature and pressure are needed.
_Source: syllabus Science, Chapter 14, Sources of Energy._
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