An exploration rover on an asteroid senses a sudden drop in terrain. It immediately transmits a radio signal to its orbiting parent spacecraft which is at a distance of 3.6 × 106 km from the rover. The parent spacecraft instantly transmits a command back telling the rover to halt.
What is the minimum time that elapses between the rover sending the initial signal and receiving the command back from the parent spacecraft? (Take the speed of radio waves to be 3.0 × 108 m s-1.)
12 ms12\text{ ms}12 ms
24 ms24\text{ ms}24 ms
12 s12\text{ s}12 s
24 s24\text{ s}24 s
198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.