Figure 1: Illustration of the rotational Doppler effect in the linear and nonlinear optical regime. Compared with the rapid development and applications of the rotational Doppler effect in linear ...

The Doppler effect can be heard particularly clearly when a train passes by. The presence of the same effect in the generalised telegraph equation indicates the wave nature of heat transport over ...

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 ...