| Date | May 2014 | Marks available | 1 | Reference code | 14M.1.HL.TZ1.19 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
Light of wavelength λ0 is emitted from a nearby galaxy. The light is received on Earth and the wavelength is measured to be λ where λ<λ0. Which of the following correctly describes the speed and direction of motion of the galaxy?
Markscheme
A
Examiners report
The vast majority of candidates understood that the fractional change in the wavelength was needed and hence discounted B or D. But it would seem that they did not read the stem carefully, where it is clear that the wavelength has decreased – indicating that it is travelling towards Earth.
