NEET 2003 Physics question

Solar energy is mainly caused due to :

(1)burning of hydrogen in the oxygen
(2)fission of uranium present in the sun
(3)fusion of protons during synthesis of heavier elementsCorrect
(4)gravitational contraction

Answer: (3)

Solution

The Sun's energy comes from nuclear fusion: at about K in its core four protons fuse (proton-proton cycle) to form a helium nucleus, releasing about 26.7 MeV per helium nucleus formed; heavier elements are synthesised from such fusion

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Question ID VK-089167