Particle Physics Revision

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

• proton
• neutron
• electron
• alpha particle

All of the following are quarks except

• strange

• bottom

• charmed

• spark

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

• True

• False

• More information is needed

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

All baryons are assigned a baryon number of ___, all anti-baryons are assigned ___, and all non-baryons are ___

• -1, +1, 0

• -1, 0, +1

• +1, -1, 0

• 0, -1, +1

All leptons are assigned a lepton number of ___, all anti-leptons are assigned ___, and all non-leptons are ___

• -1, +1, 0

• -1, 0, +1

• +1, -1, 0

• 0, -1, +1

The main three conservation laws used in particle physics are:

• Conservation of charge, baryon and lepton numbers.

• Conservation of gravity, charge and lepton numbers.

• Conservation of momentum, hadron and lepton numbers.

• Conservation of charge, hadron and lepton numbers.

Using the conservation laws, state which interaction is possible:

• proton + electron => neutron + neutrino (e-)

• proton + neutron ==> proton + proton + anti-proton

Which quarks form a neutron?

• up, up, down

• down, down, down

• up, up, up

• up, down, down