| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.14 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 14 | Adapted from | N/A |
Question
A sample of hydrogen on Earth emits a spectral line that is measured by an Earth observer to have wavelength 500 nm. The same spectral line is emitted by a galactic source that is moving away from Earth at speed of 0.1c. What is the wavelength of the galactic spectral line that will be measured by the Earth observer?
A. 50 nm
B. 450 nm
C. 550 nm
D. 5000 nm
Markscheme
C
Examiners report
[N/A]
