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Physics: Particles > 4. Hadrons and Leptons > Flashcards

4. Hadrons and Leptons Flashcards

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1
Q

What are particles that can feel the strong nuclear force called?

A

Hadrons

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2
Q

What are the two types of hadrons?

A
  1. Baryons

2. Mesons

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3
Q

Name 2 baryons

A
  1. Proton

2. Neutron

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4
Q

What is a free proton?

A

A proton that is not in the nucleus

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5
Q

What do baryons decay into?

A

A proton (most stable)

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6
Q

What are the antibaryons?

A
  1. Antiproton

2. Antineutron

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7
Q

What is the baryon number?

A

A quantum number that must be conserved

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8
Q

What is the baryon number of a proton and a neutron?

A

B = +1

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9
Q

What is the baryon number of an antiproton and an antineutron?

A

B = -1

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10
Q

What is the baryon number of a particle that is not a baryon?

A

B = 0

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11
Q

What does it mean if the baryon number of a particle interaction is not conserved?

A

The particle interaction cannot exist

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12
Q

What forms when a neutron decays?

A

A proton, an electron and an electron antineutrino

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13
Q

What interaction is beta decay caused by?

A

Weak

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14
Q

How do mesons interact with baryons?

A

Via the strong force

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15
Q

How are mesons different to baryons?

A

All mesons are unstable and they have a baryon number of 0

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16
Q

Name 2 mesons

A
  1. Pions

2. Kaons

17
Q

Which are the lightest mesons?

A

Pions

18
Q

What are the 3 versions of the pion?

A

π plus, π minus, π 0
plus = positive charge
minus = negative charge
0 = no charge

19
Q

What is the antiparticle of π plus?

A

π minus

20
Q

What is the antiparticle of π 0?

A

Itself

21
Q

What are the differences between kaons and pions?

A

Kaons are heavier and more unstable than pions so have a shorter lifetime and decay into pions

22
Q

What are the particles that cannot feel the strong nuclear force called?

A

Leptons

23
Q

Are hadrons or leptons fundamental particles?

A

Leptons, because hadrons are made up of quarks

24
Q

Name 2 leptons

A
  1. Electron

2. Muon

25
Q

What is a lepton number?

A

A quantum number like the baryon number

26
Q

What are the two types of lepton numbers?

A
  1. Electron type

2. Muon type

27
Q

What does it mean if the baryon number of a particle interaction is not conserved?

A

The particle interaction cannot exist

Physics: Particles (7 decks)

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