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AS Unit 1 - Particles > Particle interactions > Flashcards

Particle interactions Flashcards

1
Q

What is the exchange particle of the electromagnetic interaction?

A

The virtual photon

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2
Q

What is the exchange particle of the weak interaction?

A

The W boson

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3
Q

When two protons in the nucleus interact with each other, which interaction do they go through?

A

The strong nuclear interaction

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4
Q

What are exchange particles?

A

Virtual particles that lets a force act between two particles

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5
Q

What determines the range of the force of the exchange particle?

A

Size

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6
Q

How does the Electromagnetic force have infinite range?

A

Because the exchange particle, a photon, has zero mass and the size of the exchange particle determines the range- the lighter the particle the bigger the range.

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7
Q

What happens in beta minus decay?

A

Neutron decays into a proton an electron and a antineutrino

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8
Q

What happens in beta plus decay?

A

Proton decays into a neutron a positron and a electron neutrino

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9
Q

What happens in electron capture?

A

A proton ‘captures’ an electron, changing into a neutron and a electron neutrino

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10
Q

Why would a nucleus undergo electron capture?

A

Because it is proton rich

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11
Q

What happens in electron proton collisions?

A

An electron collides at high speed with a proton changing into a neutron and a electron neutrino

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12
Q

What happens in electromagnetic repulsion?

A

When two particles with equal charge get close to each other they repel and the exchange particle is a virtual photon.

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13
Q

What determines the charge of the W boson in the Feynman diagram reactions?

A

Whichever particle is causing the reaction. eg- If it is an electron collision, the electron causes the reaction and so it is a W- boson, as the electron is negative,

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14
Q

What are the options when something is conserved?

A

baryon, lepton and charge.

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15
Q

What is not conserved in the weak interaction?

A

strangeness (it changes by plus or minus 1)

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16
Q

What is the Feynman diagram for electron capture?

A
17
Q

What is the Feynman diagram for the proton-antineutrino interaction?

A
18
Q

What is the Feynman diagram for beta plus decay?

A
19
Q

What is the Feynman diagram for beta minus decay?

A
20
Q

What is the Feynman diagram for neutron-neutrino interaction?

A
21
Q

What is all of the possible quark combinations (of u d and s)?

A
22
Q

What is the Feynman diagram for beta minus decay in terms of quarks?

A
23
Q

What is the Feynman diagram for beta plus decay in terms of quarks?

A

AS Unit 1 - Particles (6 decks)

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