Question 18M.3.SL.TZ2.4d.i
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.3.SL.TZ2.4d.i |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Construct | Question number | d.i | Adapted from | N/A |
When a spaceship passes the Earth, an observer on the Earth and an observer on the spaceship both start clocks. The initial time on both clocks is 12 midnight. The spaceship is travelling at a constant velocity with γ = 1.25. A space station is stationary relative to the Earth and carries clocks that also read Earth time.
Some of the radio signal is reflected at the surface of the Earth and this reflected signal is later detected at the spaceship. The detection of this signal is event B. The spacetime diagram is shown for the Earth, showing the space station and the spaceship. Both axes are drawn to the same scale.
Construct event A and event B on the spacetime diagram.
[3]
line from event E to A, upward and to left with A on ct axis (approx correct)
line from event A to B, upward and to right with B on ct' axis (approx correct)
both lines drawn with ruler at 45 (judge by eye)
eg:
[3 marks]