Antiparticles and Photons Flashcards
1
Q
What is a photon?
A
EM waves can only exist in discrete energy packets.
2
Q
What is the formula for energy?
A
E=hf, E=hc/wavelength
3
Q
What is an antiparticle?
A
A particle has a corresponding antiparticle with the same mass but opposite charge.
4
Q
What is pair production?
A
When energy is converted into mass you get equal amounts of matter and antimatter. 2 particles
5
Q
What is the minimum energy needed for pair production to take place?
A
minimum energy is equal to total rest energy of particle produced.
6
Q
What is annihilation?
A
When a particle meets its antiparticle. All mass is converted into energy in the form of 2 gamma ray photons.
7
Q
What is the minimum energy needed for a photon produced by annihilation?
A
2Emin=2E0
