Explain how an echo of a sound wave is formed.
Describe an experiment to determine the speed of sound in air using the echo from a large vertical wall. Describe the experimental setup, indicating any recommended typical distances.
In such an experiment, a student stands at a distance of 80 m80\text{ m}80 m from the wall.
Assuming the speed of sound in air is 340 m/s340\text{ m/s}340 m/s, calculate the time delay between the student making a loud sound and hearing the echo.
State why it is more accurate to measure the total time for several successive claps (clapping in rhythm with the echoes) rather than the time for a single clap.
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.