DP Physics (last assessment 2024)
Question 18M.3.HL.TZ2.7b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ2.7b |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Discuss | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.HL.TZ2.7b
(b)
Star S-2 is in an elliptical orbit around a black hole. The distance of S-2 from the centre of the black hole varies between a few light-hours and several light-days. A periodic event on S-2 occurs every 5.0 s.
Discuss how the time for the periodic event as measured by an observer on the Earth changes with the orbital position of S-2.
[2]
Markscheme
wherever S-2 is in orbit, time observed is longer than 5.0 s
when closest to the star S-2 periodic time dilated more than when at greatest distance
Justification using formula or time is more dilated in stronger gravitational fields
[2 marks]
