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As-Level Physics - Particles and Radiation > Antiparticles And Photons > Flashcards

Antiparticles And Photons Flashcards

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1
Q

What is the electromagnetic spectrum?

A

A continuous spectrum of all the possible frequencies of electromagnetic radiation

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2
Q

What is the frequency of a wave?

A

Number of complete waves passing a point per second

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3
Q

What is the wavelength of a wave?

A

Distance between 2 adjacent crests of a wave

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4
Q

What are the 7 types of electromagnetic radiation?

A

Radio waves

Microwaves

Infra-red

Visible light

Ultra-violet

X-rays

Gamma rays

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5
Q

Which EM wave has the highest frequency?

A

Radio

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6
Q

What EM radiation has the highest wavelength?

A

Gamma

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7
Q

What does the higher the frequency mean in terms of energy?

A

Greater the energy

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8
Q

What are photons?

A

Packets of EM radiation

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9
Q

What is the formula for the energy of a photon?

A

E=hf

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10
Q

What does h stand for in E=hf?

What are the units?

A

Planck’s constant

Js

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11
Q

What is f in E=hf?

What are the units?

A

Frequency of light

Hz

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12
Q

What is the equation that relates frequency, wavelength and speed of light?

A

Frequency = speed of light ÷ wavelength

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13
Q

What is an antiparticle?

A

Each particle has a corresponding antiparticle with the same mass and rest energy but with opposite charge

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14
Q

What are all particles known as?

A

Matter

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15
Q

What are antiparticles known as?

A

Antimatter

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16
Q

What is pair production?

A

When energy is converted into mass, you get equal amounts of matter and antimatter

17
Q

When does pair production happen?

A

When there is enough energy to produce the masses of the particles

18
Q

What must pair production always produce?

Why?

A

A particle and its corresponding antiparticle

Because certain quantities must be conserved

19
Q

Why do the particles in a detector curve away from each other in opposite directions?

A

Because they are in an applied magnetic field and have opposite charges

20
Q

What is the minimum energy needed for pair production?

A

Total rest energy of the particles produced

21
Q

What is the rest energy of a particle?

A

Amount of energy that would be produced if all of its mass was transformed into energy

22
Q

Why is the minimum energy needed for pair production 2E0?

A

Pair production always produces a particle-antiparticle pair, which both have a rest energy of E0

So for there to be enough energy to produce the particles, it must be 2E0

23
Q

What is annihilation?

A

When a particle meets its antiparticle

24
Q

What happens to the mass of the particle and antiparticle during annihilation?

A

Gets converted back to energy in the form of 2 gamma ray photons

25
Q

What does annihilation produce?

A

2 photons

As-Level Physics - Particles and Radiation (7 decks)

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