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What is the main source of energy of the sun?

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Nuclear fission of heavier unstable elements in the sun.

Gravitational energy liberated during the slow contraction of the sun.

Nuclear fusion of lighter elements in the sun.

Combustion of pure carbon present in the sun.

answer is D.

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Detailed Solution

The energy of the sun is produced by the nuclear fusion of lighter elements in the core of the sun, where the temperature is of the order of 10⁷K or more.

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