A researcher stands some distance away from a large vertical concrete wall. She uses a clapperboard to produce a single loud, sharp sound. A short time later, she hears the sound again.
Explain why she hears this second sound.
The time interval between the clapperboard sound and the researcher hearing the second sound is 1.4 s. Sound travels at a speed of 340 m/s in air. Calculate the distance of the researcher from the wall.
An assistant standing directly next to the wall hears only one sound. How long after the researcher produces the sound does the assistant hear it?
State two ways in which a sound wave is different from a light wave.
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.