Queensland University of Technology provides funding as a member of The Conversation AU. When an ambulance passes with its siren blaring, you hear the pitch of the siren change: as it approaches, the ...

We have all noticed how the horn of a speeding car changes as it approaches: each wave-peak is emitted from a closer point, so the wave is “squeezed” and the pitch increases. As the car recedes, the ...

The Doppler effect has helped us measure the world around us, from the movement of stars and clouds to sound frequencies. Gillian Isoardi from Queensland University of Technology explains how it works ...