Question

Why are higher temperatures necessary for fusion of helium nuclei than for hydrogen nuclei? A. Helium...

Why are higher temperatures necessary for fusion of helium nuclei than for hydrogen nuclei?
  • A.

    Helium is chemically inert.

  • B.

    Helium nuclei are heavier than hydrogen nuclei.

  • C.

    The positive charges on helium nuclei are greater than those on the hydrogen nuclei.

  • D.

    Because E = mc2 and helium nuclei are heavier than hydrogen nuclei.

  • E.

  • The boiling point of helium is higher than that of hydrogen.

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Answer #1

For fusion process you need to accelerate the helium nucleui so that they can collide and transformed to a Carbon nuclei. In order to do that one need to supply ample energy and this energy will convert to Kinetic energy which will cause the movement of helium nuclei. Now kinetic energy is directly proportional to the mass of the nuclei. Helium having atomic number 2 has two protons and one neutron where as hydrogen has one proton only

So the right options are

B. Helium nuclei is heavier than hydrogen as it has both proton and neutron

C. Positive Charges on helium nuclei(2) is higher than hydrogen nuclei(1)

D. Because E= mc2 and helium nuclei is heavier than hydrogen nuclei

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