Multiple choice

The radiant energy from the sun is due to ___________.

  1. chemical reaction

  2. combustion

  3. nuclear fusion

  4. nuclear fission
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sun's energy is produced by nuclear fusion - hydrogen nuclei combine to form helium, releasing enormous energy. This occurs in the sun's core under extreme temperature and pressure. Chemical reactions and combustion are surface processes; nuclear fission is not the sun's energy source.

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