A long copper pipe in a building corridor has a length of 200 m200\text{ m}200 m. A plumber taps one end of the copper pipe with a wrench. An apprentice at the other end has their ear against the pipe and hears the sound of the tap.
(i) State an approximate value for the speed of sound in air.
(ii) Sound travels at 4000 m/s4000\text{ m/s}4000 m/s in copper. Calculate the time it takes for the sound to travel along the pipe.
The apprentice actually hears two sounds from the tap, separated by a short time interval. Explain why the apprentice hears two sounds.
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.