Through which process is the energy of the Sun generated?
Nuclear Fusion
Nuclear Fusion is correct.
In the Sun's core, at about 15 million °C and enormous pressure, hydrogen nuclei fuse to form helium. The mass of the helium formed is slightly less than that of the hydrogen used up, and this lost mass turns into energy as given by \(E = mc^2\).
This energy travels outward and leaves the Sun as light and heat. Solar power and thermal power are ways we use that energy on Earth, not its source, and gravitational contraction alone could keep the Sun shining for only a tiny part of its age.
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Important Questions from Radioactivity
- The energies of the 3 lowest states of an atom are E 0 = −14 eV, E 1 = −9 eV and E 2 = −7 eV. The Einstein coefficients are A 10 = 3 × 10 8 s −1 , A 20 = 1.2 × 10 8 s −1 and A 21 = 8 × 10 7 s −1 . If a large number of atoms are in the energy level E 2 , the mean radiative lifetime of this excited state is
The nuclei of 137 Cs decay by the emission of β - particles with a half life of 30.08 years. The activity (in units of disintegrations per second or Bq) of a 1 mg source of 137 Cs, prepared on January 1, 1980, as measured on January 1, 2021 is closest to
The Q - value of the α - decay of 232 Th to the ground state of 228 Ra is 4082 keV. The maximum possible kinetic energy of the α - particle is closest to
Radioactivity is the characteristic of which of the following?
A free neutron decays spontaneously into a proton, an electron and ___________ .
