A) decay of radioactive elements.
B) conversion of Hydrogen to Helium.
C) conversion of Helium to Hydrogen.
D) excess of oxygen that helps burning and release of energy.
Correct Answer: B
Solution :The inexhaustible source of energy of the stars is due to conversion of Hydrogen to Helium. In the interior of a star, the particles move rapidly in every direction because of the light temperatures present. Even so often a proton moves close enough to a nucleus to be captured, and a nuclear reaction takes place. Only protons of extremely high energy (many times the average energy in a star such as the Sun) are capable of producing nuclear events of tills kind. A minimum temperature required for fusion is roughly 10 million K. Since the energies of protons arc proportional to temperature, the rate of energy production rises steeply as temperature increases.
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