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Q. |
The energy of the sun is mainly due to |
A. | nuclear fission |
B. | radioactivity |
C. | heat |
D. | nuclear fusion |
Answer» D. nuclear fusion | |
Explanation: The Sun is a main-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to photons which are released through a cycle that even our sun uses. |
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