DP Physics (last assessment 2024)
Question 20N.3.HL.TZ0.24b
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.3.HL.TZ0.24b |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Identify | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
20N.3.HL.TZ0.24b
The cosmic microwave background (CMB) radiation is observed to have anisotropies.
(b)
Identify two possible causes of the anisotropies in (a).
[2]
Markscheme
quantum fluctuations «that have expanded» ✓
density perturbations «that resulted in galaxies and clusters of galaxies» ✓
dipole distortion «due to the motion of the Earth» ✓
Examiners report
Those who correctly identified specific characteristics of the CMB radiation were able to quote causes for this during the early Big Bang.
