Q.

Which of the following reaction is the main cause of energy radiated from Sun?

A. Nuclear fission
B. Nuclear fusion
C. Chemical reaction
D. Diffusion reaction
Answer» B. Nuclear fusion
Explanation: The Sun is a main-sequence star, and thus generates its energy bynuclear fusion of hydrogen nuclei into helium. In its core, the Sunfuses 620 million metric tons of hydrogen each second.
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