Question

Explain how 'echo' is produced.

What should be the minimum distance between the listener and the reflector to hear an echo of sound propagating with a speed v m s⁻¹?

Does the speed of sound increase or decrease on a hotter day? Justify.

Establish the relationship between speed of sound, its wavelength and frequency. If speed of sound in air is 340 m s⁻¹, calculate.