Term
|
Definition
| A baryon is a hadron composed of three quarks.
The proton and the neutron are examples of baryons. |
|
|
Term
|
Definition
| A meson is a hadron composed of one quark and one anti-quark.
The pion and the kaon are examples of mesons. |
|
|
Term
|
Definition
| A 'heavy' particle that is composed of quarks. |
|
|
Term
| Which meson that you have to know about contains a strange quark or or strange antiquark? |
|
Definition
|
|
Term
| What is the quark composition of the proton? (work it out from your data sheet!) |
|
Definition
|
|
Term
| What is the quark composition of the neutron? (work it out from your data sheet!) |
|
Definition
|
|
Term
| What is the quark composition of the positive kaon? (work it out from your data sheet!) |
|
Definition
|
|
Term
| What is the quark composition of the positive pion? (work it out from your data sheet!) |
|
Definition
|
|
Term
| What is the quark composition of the negative pion? (work it out from your data sheet!) |
|
Definition
|
|
Term
| What is the quark composition of the negative kaon? (work it out from your data sheet!) |
|
Definition
|
|
Term
| What particle is made up of a strange quark and an anti-down quark? |
|
Definition
| It is a quark and anti-quark so it is a meson. It has a strange quark so it cannot be a pion. A neutral kaon. |
|
|
Term
|
Definition
| A 'light (not heavy!)' particle. |
|
|
Term
| List the leptons we have to study in AQA physics A level. |
|
Definition
| electron positron muon anti-muon neutrino antineutrino |
|
|
Term
| What is the baryon number of a baryon? |
|
Definition
|
|
Term
| What is the baryon number of an anti-baryon? |
|
Definition
|
|
Term
| What is the lepton number of a lepton? |
|
Definition
|
|
Term
| What is the lepton number of an anti-lepton? |
|
Definition
|
|
Term
| What is the anti-particle of the electron called? |
|
Definition
|
|
Term
| What is the difference between a matter and anti-matter particle? |
|
Definition
| Antimatter particles of the same mass as their matter particles but opposite in charge. |
|
|
Term
| What happens when a particle meets its anti-particle? |
|
Definition
| They annihilate each other and two identical gamma rays of energy are created as the mass changes to energy. These propagate in opposite directions from the point of annihilation. You can calculate the energy of the gamma rays by using E=mc2 |
|
|
Term
|
Definition
| A muon is a lepton. It is basically a 'heavy' electron - it has a mass of about 200 times that of an electron and a negative charge.... but it only has a short lifetime (a mean lifetime of 2.2 × 10-6 seconds). |
|
|
Term
| How does a muonic atom (one that replaces electrons with muons?) differ from one with electrons in orbit? |
|
Definition
| 1. Heavier - but very slightly - electron mass is not significant to the mass of an atom!
2. Smaller - because, in order to conserve angular momentum, the more massive muon must be closer to the atomic nucleus than its less massive electron counterpart. |
|
|
Term
|
Definition
| Muons are produced by the weak decay of pions into a muon and a muon antineutrino. |
|
|
Term
| What does a muon decay into? |
|
Definition
| An electron, an electron-antineutrino, and a muon-neutrino. [image] |
|
|
Term
| What does a pion decay into? |
|
Definition
| - negatively charged ones into a muon and a muon antineutrino
- positively charged ones into an anti-muon and a muon neutrino
- the uncharged pion decays to an electron, positron, and a gamma ray |
|
|
Term
|
Definition
| It is the exchange particle for the strong nuclear force. |
|
|
Term
|
Definition
| A strange unstable meson It consists of an electrically charged form with a mass 966 times that of an electron or a neutral form with a mass 974 times that of an electron. It is produced as a result of a high-energy particle collision. |
|
|
