State an approximate value for:
(i) the speed of sound in air,
(ii) the speed of light in air.
Use your value from (a)(i) to calculate the frequency of a sound wave that has a wavelength of 0.85 m0.85\text{ m}0.85 m.
An observer watching a distant fireworks display records a time difference of 3.5 s3.5\text{ s}3.5 s between seeing a firework explode and hearing the sound.
(i) Calculate the distance of the fireworks display from the observer.
(ii) State an assumption you made when calculating this distance.
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.