8.2 Matter and Anti-Matter Flashcards
1
Q
What do we believe all fundamental particles have?
A
An anti-matter partner.
2
Q
What characteristics do antiparticles have?
A
- the same mass as the matter
- the opposite charge
- denoted with a bar above the symbol
3
Q
What are the quarks inside an anti-proton.
A
2 anti u and 1 anti d
4
Q
What quarks are inside an anti-neutron?
A
2 anti d and 1 anti u.
5
Q
What is the name of antimatter to an electron?
A
a positron
6
Q
What happens when matter and anitmatter get close/touch each other.
A
They annihilate.
7
Q
What happens during annihilation?
A
Gamma rays are emitted in two opposite directions (conservation of momentum).
8
Q
How can we work out energy of annihilation?
A
Using e = mc^2
9
Q
How can we work out the frequency and thus type of the emitted wave?
A
After using e = mc^2 and e = hf.
