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DGGS AS Physics > Particles > Flashcards

Particles Flashcards

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1
Q

What is the unit of specific charge?

A

C/Kg

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2
Q

Equation to find the energy of a wave using the frequency

A

E = hF

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3
Q

Rest energy

A

E=mc^2

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4
Q

What happens when a particle and corresponding antiparticle meet?

A

Annihilation takes place: two photons are created that travel perpendicular to the paths of the particles in opposite directions to each other, both have the same energy

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5
Q

How is momentum conserved in annihilation?

A

Two photons are created

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6
Q

Why are two photons created?

A

To converse momentum

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7
Q

What is the strong nuclear force carrier?

A

Pion

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8
Q

Electron exchange carrier

A

Virtual photon

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9
Q

Leptons

A

Fundamental particles that are not quarks

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10
Q

Baryons

A

Contain three quarks and will decay into protons

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11
Q

Mesons

A

Contain only two quarks and so cannot decay into protons

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12
Q

The paths in a cloud chamber are effected by?

A

Speed and/or charge

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13
Q

Particle with the highest specific charge?

A

Electron

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14
Q

How does the strong nuclear force effect nucleons?

A

At a distance of 0-0.5fm particles are repulsed from 0.5-3fm particles are attracted towards each other

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15
Q

What is an alpha particle?

A

A helium nucleus: two protons and two neutrons

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16
Q

What are the three ways to create antimatter?

A

1) Radioactive decay
2) Interactions with cosmic rays
3) High energy collisions

17
Q

Compare matter and the corresponding antimatter

A

Same mass but opposite charges

18
Q

Define an electron volt

A

The energy needed for an electron to more across a p.d. of one volt

19
Q

Conversion of joules to electron volts

A

J/1.6x10-19

20
Q

Conversion of electron volts to joules

A

eV x 1.6x10-19

21
Q

What happens to particles after pair production?

A

Each particle spirals in the opposite direction to each other due to difference in charge

22
Q

What kind of nuclei emit alpha radiation?

A

Heavy nuclei and some smaller neutron deficient nuclei

DGGS AS Physics (2 decks)

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