A research satellite is in orbit 15 000 km15\,000\text{ km}15000 km from a tracking station on Earth. A radio signal is sent from the station to the satellite, which is then reflected back to Earth.
How long does it take for the radio signal to travel to the satellite and back to the station? (The speed of radio waves is 3.0 × 108 m/s.)
0.05 ms0.05\text{ ms}0.05 ms
0.10 ms0.10\text{ ms}0.10 ms
0.05 s0.05\text{ s}0.05 s
0.10 s0.10\text{ s}0.10 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.