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Particles Flashcards

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1
Q

What is the specific charge and what are it’s units

A

The ration of the charge to the mass of a particle, it’s units are C kg^-1

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2
Q

What is the nucleon number?

A

The top number in the atomic notation and is the total number of neutrons and protons in a given nucleus and so is it’s mass

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3
Q

What are the 4 fundamental forces?

A

Gravity, strong nuclear force, weak nuclear force and electromagnetism

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4
Q

What is the quark structure and strangeness of a positive Kaon?

A

Up and anti strange giving a strangeness of +1, charge of +e and baryon number 0

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5
Q

What is the formula for beta plus decay

A

A proton decays into a neutron and emits a positron and an electron neutrino via a W+ boson

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6
Q

What happens in beta minus decay?

A

A neutron decays into a proton and emits an electron and an anti electron neutrino via the W- boson

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7
Q

What happens in electron capture?

A

A proton and an electron interact via the W+ boson and form a neutron and an electron neutrino, this happens within the nucleus so changes which element we have

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8
Q

What is the electron proton collision?

A

An electron and proton interact via the W- boson and emit a neutron and an electron neutrino, happens outside of the nucleus

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9
Q

What is the force carrier for an electron interaction?

A

A virtual photon with symbol gamma

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10
Q

What are the 4 conserved quantities in a particle interaction?

A

Momentum, charge, baryon number and strangeness

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11
Q

What is the baryon number on all baryons and anti baryons?

A

All baryons have a baryon number of +1 and all anti baryons have a baryon number of -1 as all quarks have a baryon number of 1\3

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12
Q

What is the quark configuration of a proton, antiproton, neutron and antineutron?

A

A proton is uud, anti proton is anti uud, neutron is udd and anti neutron is anti udd

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13
Q

What happens when a positron and an electron collide

A

They annihilate and emit at least two virtual photons to take care of the excess energy that needs to be conserved in the interaction

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14
Q

When is strangeness conserved?

A

It is only conserved in the strong and electromagnetic interactions and NOT in the weak interactions

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Physics (9 decks)

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