A researcher on a boat uses a sonar system to map the seabed. The system emits a high-frequency sound pulse into the water and registers the return signal some time later.
Which wave phenomenon enables the sound pulse to return to the receiver?
The sound waves are absorbed by the seabed.
The sound waves are diffracted by the sea surface.
The sound waves are reflected from the seabed.
The sound waves are refracted as they enter the seabed.
295 exam-style questions on CIE IGCSE Physics Sound, covering Sound. Each one has a worked solution and a mark scheme showing where the marks go.