DP Physics (last assessment 2024)
Question 22M.2.SL.TZ1.5a
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.SL.TZ1.5a |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Describe | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
22M.2.SL.TZ1.5a
(a)
Describe the quark structure of a baryon.
[2]
Markscheme
3 quarks / example with three quarks «e.g. up up down» ✓
integer / zero / 1 / no fractional «electron» charge
OR
held together by the strong force / gluons
OR
half integer spin
OR
baryon number = 1
OR
colour neutral ✓
Examiners report
A significant number of candidates recognized that baryons are composed of three quarks. The second mark was for a statement concerning baryons as a result of the quark composition, and not for a general statement about the quarks (e.g. "the baryon number is 1" rather than "each quark has a baryon number of ⅓). It is worth noting that the information about individual quarks is given in the data booklet which is why no marks were awarded for simply copying this information over.
