DP Physics (first assessment 2025)
Question 21N.2.SL.TZ0.a
| Date | November 2021 | Marks available | [Maximum mark: 2] | Reference code | 21N.2.SL.TZ0.a |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
21N.2.SL.TZ0.a
State what is meant by the Doppler effect.
[2]
Markscheme
the change in the observed frequency ✓
when there is relative motion between the source and the observer ✓
Do not award MP1 if they refer to wavelength.
