Describe the Doppler effect as it applies to sound waves.
An industrial drone carrying an acoustic warning beacon flies in a horizontal circular path of radius 1.50 m at a constant speed. The beacon emits a continuous sound wave at a constant frequency of f0=1800 Hzf_0 = 1800 \text{ Hz}f0=1800 Hz.
An observer stands a large distance away in the plane of the circular path, holding a microphone.
The drone completes exactly 1.20 full revolutions per second.
Show that the speed of the drone in its circular path is approximately 11.3 m s-1.
The speed of sound in air is 340 m s-1. Calculate the maximum frequency of the sound detected by the observer's microphone. Give your answer to 3 significant figures.
Calculate the minimum frequency of the sound detected by the observer's microphone. Give your answer to 3 significant figures.
