UPSC Geography The origin and evolution of the earth Question Bank Universe / Sun / Planets / Earth

  • question_answer The inexhaustible source of energy of the stars is due to

    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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