It takes 0.18 seconds for a laser signal to travel from a research station on Earth to a satellite and then back to the station. Laser signals travel at 3.0 × 108 m/s.
How far is the research station from the satellite?
27 000 km27\,000\text{ km}27000 km
54 000 km54\,000\text{ km}54000 km
27 000 000 km27\,000\,000\text{ km}27000000 km
54 000 000 km54\,000\,000\text{ km}54000000 km
237 exam-style questions on CIE IGCSE Physics General properties of waves, covering General properties of waves. Each one has a worked solution and a mark scheme showing where the marks go.