Particle Physics

What are the four fundamental forces from strongest to weakest?

• Electrostatic, Gravity, Strong nuclear, weak nuclear

• Gravity, Strong nuclear, weak nuclear, Electrostatic

• Strong nuclear, Gravity, weak nuclear, Electrostatic

• Strong nuclear, Electrostatic, weak nuclear, Gravity

Acts between any charged particles, can be attractive (opposite charges), or repulsive (like charges). It has an infinite range and is relatively strong.

• Gravity

• Electrostatic

• Strong nuclear

• Weak nuclear

Acts between any objects that have mass, it is always attractive, has an infinite range but is relatively weak.

• Gravity

• Electrostatic

• Strong nuclear

• Weak nuclear

Explains beta emission but as this does not always occur, it must be weaker than the strong force. It involves nucleons but also lighter particles, such as electrons.

• Gravity

• Electrostatic

• Strong nuclear

• Weak nuclear

Holds the nucleons in an atom together. It must be strong as it overcomes the electrostatic repulsion between protons. It only acts over very short distances.

• Gravity

• Electrostatic

• Strong nuclear

• Weak nuclear

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

There are three families of leptons;

• electron, muon, and pi.

• electron, muon, and tau.

• electron, pi and tau.

• electron, pi and neutrino.