A remote-controlled rover is exploring the surface of a distant moon. It detects a hazard ahead and immediately sends a radio alert to the command center on Earth. The command center is 3.6 × 106 km away. Immediately upon receiving the signal, the command center sends an instruction back to the rover to halt.
What is the minimum time that elapses between the rover detecting the hazard and receiving the instruction back to halt? (Assume the speed of radio waves is 3.0 × 108 m/s.)
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.