U4 - Standard Model

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From strongest to weakest, list the four fundamental forces.

• Electromagnetic

• Weak Nuclear

• Strong Nuclear

• Gravitational

Up quarks are fundamental particles that experience the ​ (a)   force and may be combined with other quarks to form ​ (b)   and baryons.

Tau particles are also fundamental particles belonging to the ​ (c)   group of subatomic particles. These particles experience the ​ (d)   force, and unlike quarks they do not combine with other leptons to form other subatomic particles.

Both particles experience the ​ (e)   force.

• strong nuclear
• mesons
• lepton
• weak nuclear
• electromagnetic
• gravitational
• neutrino
• hadron
• electrostatic
• photon

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The Feynman diagram represents the interaction between an ​ (a)   and a positron through ​ (b)   . During this interaction, a ​ (c)   is exchanged between the electron and ​ (d)   , before both particles change ​ (e)   as they move away from each other.

• Bhaba scattering
• electron
• photon
• velocity
• positron
• Neutrino
• Proton
• Neutron
• gluon
• quark

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