The sun is constantly radiating energy and yet its surface temperature is nearly constant at 6000C. The constancy of solar temperature is due to

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Q: 62 (NDA-II/2010)
The sun is constantly radiating energy and yet its surface temperature is nearly constant at 6000°C. The constancy of solar temperature is due to

question_subject: 

Geography

question_exam: 

NDA-II

stats: 

0,20,26,11,11,20,4

keywords: 

{'solar temperature': [0, 0, 1, 0], 'sun': [3, 0, 0, 6], 'surface temperature': [1, 0, 0, 1], 'black hole evaporation': [0, 0, 1, 0], 'radioactivity': [0, 0, 0, 2], 'energy': [0, 0, 1, 2], 'constancy': [0, 1, 1, 0], 'fission': [0, 0, 0, 1]}

The provided answer, option 3 - fusion, is the correct explanation for the constancy of the sun`s surface temperature at 6000°C. Fusion is the process in which light atomic nuclei combine to form heavier nuclei, releasing a tremendous amount of energy in the form of radiation.

Option 1 - fission, is the process of splitting heavy atomic nuclei, which is not applicable to the sun`s temperature constancy.

Option 2 - radioactivity, refers to the spontaneous emission of radiation from unstable atomic nuclei. While radioactivity occurs in the sun, it does not explain the constancy of its temperature.

Option 4 - black hole evaporation, is not applicable to the sun, as black holes are extremely dense objects with powerful gravitational forces.

Therefore, option 3 - fusion, is the only logical explanation for the constancy of the sun`s surface temperature. During fusion, the sun converts hydrogen atoms into helium through a series of nuclear reactions, releasing a steady amount of energy that maintains its temperature.