Question

Why nuclear fusion reaction is called thermonuclear reaction?

Answer 1

Nuclear fusion is also called thermonuclear reaction because it takes place at extremely high temperature and hence create enormous amount of energy.
eg.- reactions in the sun .

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Answer 2

Answer:Nuclear fusion is also called thermonuclear reaction because a lot of heat and pressure is required to carry out the process inorder to overcome the electrostatic force of repulsion between two nuclei. It also produces a large amount of energy.

Explanation: