Particle Physics

In the standard model, the particle considered to be an elementary particle is a(n)

• proton
• neutron
• electron
• alpha particle

These are light, elementary particles that are not made up of quarks.

• Gluons

• Electrons

• Leptons

• Baryon

These are the category of hadrons that contain three quarks. This distinguishes them from mesons, which contain two (1 quark and 1 antiquark).

• Gluons

• Electrons

• Leptons

• Baryons

There are three families of leptons;

• electron, muon, and pi.

• electron, muon, and tau.

• electron, pi and tau.

• electron, pi and neutrino.

a hadron with 3 quarks

• hadron

• baryon

• neutron

• down quark

a hadron with one quark and one antiquark

• neutron

• baryon

• hadron

• meson

an electron with a positive charge

• neutrino

• gauge boson

• positron

• gluon

Which statement describes β^- decay in terms of a simple quark model?

• A down quark changes to an up quark and emits an electron and an electron antineutrino.

• A down quark changes to an up quark and emits a positron and an electron neutrino.

• An up quark changes to a down quark and emits an electron and an electron antineutrino.

• An up quark changes to a down quark and emits a positron and an electron neutrino.

Which row gives the correct classification of protons, electrons, and neutrinos?

• A

• B

• C

• D

A proton is made up of two up quarks and one down quark with charges of +2/3, +2/3, and –1/3. 

• True 
• False
• More information is needed