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AQA A-Level Physics flashcards > Family tree > Flashcards

Family tree Flashcards

1
Q

What particles make up subatomic particles?

A

Leptons (subject to the weak force) and hadrons (subject to the strong and weak force)

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2
Q

What particles make up hadrons?

A

Mesons and Baryons

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3
Q

What particles make up mesons and baryons?

A

Quarks (up quarks, down quarks, strange quarks).

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4
Q

What does a meson consist of?

A

A quark-antiquark pair

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5
Q

What does a baryon consist of?

A

3 quarks or 3 antiquarks

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6
Q

What is 1 eV the equivalent of?

A

1 eV= 1.6*10-19J (charge of an electron)

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7
Q

What 3 quarks do you need to know?

A

Up quarks, down quarks and strange quarks

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8
Q

What 3 Leptons do you need to know?

A

Electrons, Muons, Electron Neutrinos

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9
Q

What 2 bosons (forces) do you need to know?

A

Photons, weak forces (W)

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10
Q

True or False, Do Leptons live in the nucleus?

A

False, they don’t live in the nucleus

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11
Q

What are examples of leptons?

A

Electrons, muons, tauons

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12
Q

True or False, Do Hadrons live in the nucleus?

A

True, They live in the nucleus

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13
Q

What quarks make up a proton (a baryon)?

A

2 up quarks and 1 down quark (UUD)

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14
Q

What quarks make up a neutron (a baryon)?

A

1 up quarks and 2 down quarks (UDD)

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15
Q

What is the baryon number of a proton and neutron?

A

1

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16
Q

What are the most important types of mesons?

A

Kaons and Pions

17
Q

True or False, Do kaons always have a strange particle in them?

A

True, Kaons always have a strange particle in them

18
Q

What does an antibaryon consist of?

A

3 antiquarks

19
Q

What combination of quarks make up an antiproton

A

2 anti-up quarks, and 1 anti-down quarks

20
Q

True or False, The Sigma (Σ) particle is a baryon containing a strange quark

A

True, The sigma (Σ) particle contains a strange quark

21
Q

If a particle is a lepton what is its lepton and baryon number?

A

Lepton number = 1, Baryon number = 0

22
Q

If a particle is an anti-lepton what is its lepton and baryon number?

A

Lepton number = -1, Baryon number = 0

23
Q

What is the strangeness number for a strange quark?

A

The strangeness number is -1

24
Q

What is the baryon number for a quark?

A

The baryon number for a quark is +1/3

25
Q

If a particle is a baryon what is its lepton and baryon number?

A

Lepton number = 0, Baryon number = 1

26
Q

If a particle is an anti-baryon what is its lepton and baryon number?

A

Lepton number = 0, Baryon number = -1

27
Q

If a particle is a meson what is its lepton and baryon number?

A

Lepton number= 0, Baryon number = 0

28
Q

What things need to be conserved for a particle to decay?

A

The lepton number, charge, baryon number, strangeness number

AQA A-Level Physics flashcards (2 decks)

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