Classification of particles and quarks：練習問題

Which of the following is a possible quark-antiquark combination for a meson with a charge of \( +1e \) and a strangeness of \( 0 \)?

In a deep underground experiment, a student observes a particle interaction involving the weak nuclear force. Which of the following statements correctly describes a characteristic of the W boson exchange particles?

A particle \( X \) decays via the weak interaction into a muon, a muon antineutrino, and an electron neutrino. If all conservation laws are obeyed, what is the most likely identity of particle \( X \)?

Which of the following nuclei has the largest specific charge?

A particle has a rest energy of \(494\text{ MeV}\) and carries a strangeness of \(-1\). Which of the following describes the quark composition of its antiparticle if it is a meson?
(Assume the particle is a \(K^-\))

A neutral pion \( \pi^0 \) is a meson that can decay into two photons via the electromagnetic interaction. State the quark composition of a \( \pi^0 \) and explain why its decay does not involve the weak interaction despite it being a particle decay.

A specific baryon contains one strange quark and has a total charge of \( 0 \). Determine the full quark composition of this baryon and deduce the quark composition of its corresponding antiparticle, ensuring all quantum numbers are appropriately inverted.

An electron is accelerated from rest through a potential difference \( V \). If its final de Broglie wavelength is \( \lambda \), show that \( V \) is inversely proportional to \( \lambda^2 \), assuming non-relativistic speeds.