| Date | November 2015 | Marks available | 1 | Reference code | 15N.1.HL.TZ0.16 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 16 | Adapted from | N/A |
Question
A radio telescope has a circular collecting dish of diameter 5.0 m. It is used to observe two distant galaxies that are both emitting electromagnetic radiation of wavelength 20 cm. The images of the galaxies are just resolved by the telescope. What is the angle subtended by the galaxies at the telescope?
A. 0.05 rad
B. 0.3 rad
C. 5 rad
D. 30 rad
Markscheme
A
Examiners report
[N/A]
