DP Physics (last assessment 2024)
Question 20N.3.HL.TZ0.b(i)
| Date | November 2020 | Marks available | [Maximum mark: 2] | Reference code | 20N.3.HL.TZ0.b(i) |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | b(i) | Adapted from | N/A |
b(i).
[Maximum mark: 2]
20N.3.HL.TZ0.b(i)
In the Pound–Rebka–Snider experiment, a source of gamma rays was placed vertically above a gamma ray detector, in a tower on Earth.
Explain the cause of the frequency shift for the gamma rays in your answer in (a) in the Earth’s gravitational field.
[2]
Markscheme
gained by photons so increases ✓
, so frequency increases ✓
Examiners report
A simple conceptual explanation in terms of the energy changes was not present.
