Multiple choice

The main source of energy of the sun is

  1. fusion of heavy nuclei

  2. fusion of light nuclei

  3. fission of light nuclei

  4. both fusion and fission

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Sun generates energy primarily through nuclear fusion, where hydrogen nuclei fuse to form helium. This process involves light nuclei, not heavy ones or fission.