Authors: Eric Su
The radio wave changes direction upon reflection. It also changes frequency if it is reflected by a moving surface. In the standing wave formed by the incident wave and the reflected wave, the formation of the nodes requires both waves to have the same wavelength. The nodes exist in all reference frames. This requires both the incident wave and the reflected wave to have the same wavelength in all reference frames. However, these two waves have different frequencies due to Doppler effect Therefore, these two waves travel at different speeds. Doppler radar is a good example. With two moving surfaces to reflect the radio wave between them, the radio wave can be accelerated if the distance between two reflective surfaces decreases with time.
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