Questions
1 The spin of a particle is known to be +1. The particle could be a....... quark.
... lepton.
... baryon.
... meson.
2 In pair production the energy of the incident photon must be greater for muon pair production than electron-positron production because....... electrons and positrons are stable.
... muons have more mass then electrons.
... muons are baryons.
... muons are fermions.
3 We believe that isolated quarks have not been observed because....... they occur only in pairs.
... they are unstable outside the nucleus.
... we cannot observe collisions with enough energy.
... they are mathematical entities.
4 Quarks were given their name by....... Einstein.
... Murray Gell-Mann
... De Broglie.
... James Joyce.
5 According to the standard model there are....... six fundamental elementary particles.
... twelve fundamental elementary particles.
... twenty four fundamental elementary particles.
... over 200 six fundamental elementary particles.
6 An electron is as a....... lepton.
... hadron
... photon.
... meson.
7 Which of the following particles is unstable when isolated?... a gamma ray.
... an electron.
... a neutron.
... a neutrino.
8 Which of the following has the greater penetrating power?A beta particle.
A gamma ray.
An X-ray
A neutrino.
9 The standard model is....... true.
... a conjecture.
... a well developed theory.
... not supported by evidence.
10 Which of the following could not be a meson with a charge of +1?A positron.
A pion.
A kaon.
A rho particle.