5. Which of the four interactions (strong, electromagnetic, weak, gravitational) does theelectron take part in? The neutrino? The proton?6. Quarks have spin 1/2. How do you account for the fact that baryons have spin 1/2 or3/2, and mesons have spin 0 or 1?

Solution: 5) The electrons come under leptons which take part in the weak interaction. The neutrino can interact via the weak interaction The proton is confined inside the nucleus by a strong nuclear force. So it takes part in the strong interaction6) Baryons are composed of three quarks and each quark has spin S = 1/2. Let S1, S2, and S3 be the spin of three quarks. If two quarks interact, the resultant spin can be S1 - S2 to S1 + S2 The resultant spin will be 1/2 and 3/2. Mesons are composed of quark and anti-quark and each quark spin is 1/2. The resultant spin will be 0 and 1.

Answered: 5. Which of the four interactions…

5. Which of the four interactions (strong, electromagnetic, weak, gravitational) does the electron take part in? The neutrino? The proton? 6. Quarks have spin 1/2. How do you account for the fact that baryons have spin 1/2 or 3/2, and mesons have spin 0 or 1?