(a(i))[1]
State the name of the apparatus used to measure the distance from the student to the wall.
(a(ii))[1]
Explain how sound gives rise to an echo.
(b)[4]
Use the information given to determine the speed of sound. State the unit.
Physics 0625 · IGCSE · Sound
Sound — practice question
This question concerns measuring the speed of sound in air. A student is positioned in front of a large wall. She strikes a drum and then hears an echo. Fig. 8.1 shows where the student and the wall are. The diagram is labelled with: student, wall.