1.3 Antiparticles and Photons

Question 1

Electromagnetic spectrum

Answer 1

A continuous spectrum of all the possible frequencies of electromagnetic radiation

Question 2

Frequency

Answer 2

Number of complete waves passing a point per second

Question 3

Wavelength

Answer 3

The distance between two adjacent crests of a wave

Question 4

Photos

Answer 4

A ‘packet’ of EM radiation

Question 5

Antiparticle

Answer 5

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

Question 6

Pair production

Answer 6

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

Question 7

When can pair production happen?

Answer 7

If there’s enough energy to produce the masses of the particles

• it must produce a particle and its corresponding antiparticle because certain quantities must be conserved

Question 8

What happens when a photon had enough energy?

Answer 8

It can produce an electron positron pair

Question 9

Rest energy

Answer 9

The minimum energy needed for pair production

Question 10

Annihilation

Answer 10

When a particle meets its antiparticle