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What type of Reaction takes place in sun?

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What type of Reaction takes place in sun?

(a) Nuclear fusion

(b) Nuclear fission

(c) Spontaneous fission

(d) Double beta decay

This question was posed to me in examination.

This question is from Nuclear Fission & Nuclear Fusion in chapter Nuclear Power Plant of Energy Engineering

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Right option is (a) Nuclear fusion

For explanation: Nuclear fusion reaction takes place in sun as well as stars. The process is carried by proton-proton chain. The sun starts with protons, and through a series of steps, turns them into helium. Every second 600 million tons of hydrogen is converted into helium. The reaction releases tremendous amount of heat and energy.

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