| Date | May 2013 | Marks available | 2 | Reference code | 13M.3.HL.TZ1.23 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Identify | Question number | 23 | Adapted from | N/A |
Question
This question is about elementary particles.
The quark is said to be an elementary particle.
(i) State what is meant by the term elementary particle.
(ii) Identify another elementary particle other than the quark.
Markscheme
(i) particle with no internal structure / cannot be broken down further;
(ii) Electron / neutrino / any lepton / any named exchange particle;
Examiners report
Well answered although many answers just said “lepton” in (ii) without naming it.
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