Pick out the CORRECT statement/s from the following:

(a) Electron emission during β-decay is always accompanied by neutrino

(b) Nuclear force is charge independent.

(c) Fusion is the chief source of stellar energy

CONCEPT:

• Beta-decay: When a nucleus is unstable because it has too many or too few neutrons relative to protons. The nucleus emits a beta particle and energy.

​¹⁴C₆  —→  ​14N7  +  ⁰e_-1 

where  0e-1 is a beta particle.

• In beta-minus decay, a neutron breaks down to a proton and an electron, and the electron is emitted from the nucleus.
• A β-decay is always accompanied by an anti-neutrino.
• Strong nuclear force: The force created between nucleons by the exchange of particles called mesons.
  • Due to this force, the particles protons and neutrons will stick to each other.
  • This force doesn't depend on the charge as it works on neutrons (which has no charge) and protons.
• Stellar energy is the energy of a star. It is a combination of

1. the intern  al energy of a s tar.
2. the energy radiated by a star.
3. the energy of the stars.

EXPLANATION:   

• From the definition of Nuclear force, this force works inside the nucleus on neutrons and protons.
  • And neutrons are chargeless, so it is clear that the Nuclear force is charge independent.
  • So statement (b) is correct.
• ​Stellar energy is the energy of a star.
  • We know that a star gets its energy from the fusion reaction of Hydrogen and Helium.
  • So statement (c) is correct.
• During a Beta-decay from the above definition, it is clear that A β-decay is always accompanied by an anti-neutrino.
  • ​So statement (a) is wrong.
• Hence the correct answer will be option 4.