A student stands in front of a tall vertical cliff. She claps her hands loudly and detects the echo after a time interval of 1.5 s1.5\text{ s}1.5 s.
Describe how an echo is produced.
The speed of sound in air is 340 m/s340\text{ m/s}340 m/s. Calculate the distance travelled by the sound in 1.5 s1.5\text{ s}1.5 s.
Calculate the distance from the student to the cliff.
The student walks directly away from the cliff. Describe the shape of a graph showing how the time interval to hear the echo changes as the distance from the cliff increases.
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.