A person is standing in an open field near a tall, flat concrete wall of a building. Further away in the field, a starting pistol is fired to begin a race.
The person hears a loud bang from the starting pistol and then hears a quieter, similar bang shortly afterwards. State what causes this second quieter bang.
The time interval between when the person sees the flash of the starting pistol and when they hear the first loud bang is 1.4 s1.4\text{ s}1.4 s. Calculate the distance from the starting pistol to the person. Use the speed of sound in air = 340 m/s340\text{ m/s}340 m/s.
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.