DP Physics (last assessment 2024)
Question 20N.3.HL.TZ0.22d
| Date | November 2020 | Marks available | [Maximum mark: 3] | Reference code | 20N.3.HL.TZ0.22d |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 3]
20N.3.HL.TZ0.22d
The data for the star Eta Aquilae A are given in the table.
is the luminosity of the Sun and is the mass of the Sun.
(d)
Eta Aquilae A is a Cepheid variable. Explain why the brightness of Eta Aquilae A varies.
[3]
Markscheme
reference to change in size ✓
reference to change in temperature ✓
reference to periodicity of the process ✓
reference to transparency / opaqueness ✓
Examiners report
Candidates were clearly familiar with Cepheids and the process leading to its variability in brightness.
