2.6 Quarks and antiquarks

• Quarks have a charge of +2/3 or -1/3.
• The up quark has a charge of +2/3.


  True
• What is the quark composition of a proton?

  uud
• Quarks have a charge of +2/3 or -1/3.
• Quarks have a fractional charge of either +2/3 or -1/3.
• What is the quark composition of a neutron?

  udd
• Each quark has a color charge of red, green, or blue.
• What are antiquarks?

  Antiparticles of quarks
• Antiquarks have a spin of -1/2.

  True
• Quarks have fractional electric charges.


  True
• Quarks are spin-1/2 fermions.


  True
• What are the three primary properties of quarks?

  Charge, color, spin
• Quarks are spin-1/2 fermions.

  True
• Antiquarks have the same mass as quarks but opposite charge
• Baryons are composed of three quarks
• Give an example of a meson.

  Pion
• Individual quarks cannot be observed in isolation.


  True
• The Standard Model explains how particles interact through four fundamental forces
• How many types of quarks are there?

  Six
• There are six types of quarks, also known as flavours
• Quarks have integer charges, like protons and neutrons.

  False
• Quarks and antiquarks are fundamental particles with charges of +2/3 or -1/3
• Quarks have fractional electric charges.


  True
• Quarks are spin-1/2 fermions
• What is the intrinsic angular momentum of quarks in units of ħ?

  1/2
• Match the antiquark property with its value:

  Charge ↔️ -2/3 or +1/3

  Color ↔️ Antired, antigreen, antiblue

  Spin ↔️ -1/2
• Protons are baryons composed of two up quarks and one down
• What force becomes stronger as quarks are pulled apart, leading to quark confinement?

  Strong nuclear force
• Order the fundamental forces by decreasing relative strength:

  1️⃣ Strong

  2️⃣ Weak

  3️⃣ Electromagnetic

  4️⃣ Gravity
• What are quarks and antiquarks?

  Fundamental particles
• How many types of quarks are there?

  Six
• The down quark has a charge of -1/3.
• A neutron has no charge because it is composed of one up quark and two down quarks.


  True
• What are quarks and antiquarks?

  Fundamental particles
• The up quark has a charge of +2/3.


  True
• What are the possible charge values of quarks?

  +2/3 or -1/3
• Quarks are spin-1/2 fermions.


  True
• Antiquarks have a charge of -2/3 or +1/3.
• What are the three primary properties of quarks?

  Charge, color, spin
• Quarks have a color charge of red, green, or blue.