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Physics > Particle Physics > Flashcards

Particle Physics Flashcards

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1
Q

what does A represent when discussing an atom

A

The nucleon number (the number of protons + neutrons)

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2
Q

What does a represent when discussing an atom

A

The proton number

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3
Q

What is the charge of proton

A

1.6 x 10^-19

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4
Q

What is the charge of an electron

A

-1.6x10^-19

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5
Q

What is the charge of a neutron

A

0

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6
Q

What is the mass of an electron

A

9.11 x 10^-31

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7
Q

What is the mass of a proton

A

1.673 x 10^27

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8
Q

What is the mass of a neutron

A

1.675 x 10^-27

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9
Q

Define isotope

A

An element with the same number of protons and electrons but a different number of neutrons

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10
Q

Define specific charge

A

It is the ratio of charge to mass

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11
Q

What is the equation for specific charge

A

Specific charge = charge (C) / mass (Kg)

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12
Q

What is the unit for specific charge

A

CKg^-1

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13
Q

What are antiparticles

A

They are the opposite of a particle with the same mass with opposite charge

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14
Q

What is the antiparticle of an electron

A

Positron

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15
Q

What is annihilation

A

When a particle and antiparticle collide they produce TWO photons of energy

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16
Q

What is a photon

A

A packet of energy

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17
Q

What is pair production

A

A SINGLE photon of energy with a minimum rest energy produces a particle antiparticle pair

18
Q

Where does pair production occur

A

Near a nucleus

19
Q

What is the equation for creation and annihilation

A

E(rest) = m x c^2

20
Q

What is a quark

A

Fundamental particles

21
Q

What are the 3 types of quarks you need to know

A

Up down and strange

22
Q

What is the charge, baryon number and strangeness of a up quark

A

C = 2/3 B = 1/3 S = 0

23
Q

What is the charge, baryon number and strangeness of a Down quark

A

C=-1/3 B=1/3 S=0

24
Q

What is the charge, baryon number and strangeness of a strange quark

A

C=-1/3 B=1/3 S=-1

25
Q

What is the strangeness of a S antiparticle

A

1

26
Q

What are baryons

A

Particles made by 3 quarks

27
Q

What are mesons

A

Particles made by a quark antiquark duo

28
Q

Name the two types of baryons

A

Protons and neutrons

29
Q

Name two types of mesons

A

Kaon and pion

30
Q

Composition of a kaon plus

A

Up anti strange

31
Q

Composition of kaon minus

A

Anti up strange

32
Q

Composition of pion plus

A

Up anti down

33
Q

What is the rest energy of an electron

A

0.51MeV

34
Q

What are leptons

A

Another type of fundamental particle

35
Q

What are the 6 leptons

A

Electron
Electron neutrino
Muon
Muon neutrino
Tauon
Tauon neutrino

36
Q

What 3 things must be conserved

A

Charge
Baryon number
Lepton number

37
Q

When is strangeness conserved

A

Everywhere except in weak interaction (decays)

38
Q

When is they strong force repulsive for neutron neutron or proton neutron

A

0-0.7Fm

39
Q

When is the strong force strongly attractive for neutron neutron and neutron proton?

A

0.7-3Fm

40
Q

When is the strong force neutral for proton neutron or neutron neutron

A

5fm

41
Q

When is the electromagnetic force and strong force repulsive for proton proton

A

0-0.7fm and 2+(weak)

42
Q

When is the strong force and electromagnetic force attractive

A

0.7-2

Physics (1 decks)

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