| Date | May 2018 | Marks available | 1 | Reference code | 18M.1.HL.TZ1.29 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 29 | Adapted from | N/A |
Question
Two lines X and Y in the emission spectrum of hydrogen gas are measured by an observer stationary with respect to the gas sample.
The emission spectrum is then measured by an observer moving away from the gas sample.
What are the correct shifts X* and Y* for spectral lines X and Y?
Markscheme
C
Examiners report
[N/A]
