2.3 Particles, antiparticles, and photons

• Match the particle type with its spin property:

  Fermions ↔️ Half-integer spin

  Bosons ↔️ Integer spin
• What is the charge of an antiproton?

  Negative
• What is the antiparticle of a proton?

  Antiproton
• At what speed do photons travel in a vacuum?

  Speed of light
• The amount of matter a particle contains is called its mass
• What is the intrinsic angular momentum of a particle called?

  Spin
• Particles with integer spin are called bosons
• Match the particle with its antiparticle:

  Electron ↔️ Positron

  Proton ↔️ Antiproton
• What is a photon?

  Particle of light
• At what speed do photons travel in a vacuum?

  Speed of light
• Particle-antiparticle annihilation is important in particle physics and astrophysics.


  True
• Photons enable the transmission of energy and information through the electromagnetic field.


  True
• Particles are the fundamental building blocks of matter and energy in the universe.
• Bosons are particles with integer spin.
• Antiparticles have the same mass but opposite charge as their corresponding particles.
• A photon is a particle of light that exhibits the characteristics of both a particle and a wave.
• Photons are classified as bosons because they have integer spin.
• Match the particle type with its spin characteristic:

  Fermions ↔️ Half-integer spin

  Bosons ↔️ Integer spin
• Fundamental properties of particles determine how they interact with each other and with fields.

  True
• The mass of an antiparticle is the same as the mass of its corresponding particle
• Photons are massless
• What happens when a particle and its antiparticle collide?

  Annihilation
• Which equation describes the energy released during particle-antiparticle annihilation?

  $E =$$mc^{2}$
• The mass of a particle is the amount of matter it contains.


  True
• What is the antiparticle of an electron?

  Positron
• Antiparticles have the same mass but opposite charge as their corresponding particles.

  True
• Photons have mass.

  False
• What are particles considered in the universe?

  Fundamental building blocks
• The electrical charge of a particle can be positive, negative, or neutral.


  True
• Which type of particle includes electrons and quarks?

  Fermions
• What is the antiparticle of an electron called?

  Positron
• The electrical charge of an antiparticle is opposite to that of its corresponding particle.

  True
• Photons have no electrical charge.


  True
• Steps of particle-antiparticle annihilation

  1️⃣ Particle and antiparticle collide

  2️⃣ Mass is converted into energy

  3️⃣ Energy is released as photons
• Photons are fundamental particles of light and electromagnetic radiation