Question

why nuclear fission is done before nuclear fusion

Answer 1

Nuclear fission releases heat energy by splitting atoms. This resulting energy is then used to heat water in nuclear reactors and ultimately produces electricity. The high-speed neutrons that are ejected become projectiles that initiate other fissionreactions, or chain reactions.

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Answer 2

because nuclear fission is less energetic as compared to nuclear fusion. nuclear fusion produces more energy as compared to nuclear fission