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Question

Energy in the sun is mainly generated by
  1. Chemical reaction
  2. Fission of helium nuclei
  3. Fusion of hydrogen nuclei
  4. Fusion of radioactive materials

A
Chemical reaction
B
Fission of helium nuclei
C
Fusion of hydrogen nuclei
D
Fusion of radioactive materials
Solution
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Nuclear fusion is a nuclear reaction in which two or more atomic nuclei at a very high speed and join to form a new type of atomic nucleus. Fusion reactions are high energy reactions in which two lighter atomic nuclei fuse to form a heavier nucleus. This fusion reaction is taking place inside the sun core as hydrogen nuclei.

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