Authors: Eric Su
The reflection symmetry is a physical property for inertial reference frames. It shows that the elapsed time in one inertial reference frame is identical to the elapsed time in another inertial reference frame. The same symmetry also leads to the conservation of the wavelength across inertial reference frames. The velocity of a wave is proportional to its frequency. Doppler effect shows that both the velocity and the frequency depend on the reference frame. The higher the detected frequency is, the faster the wave travels toward the detector. One example is the radar gun used by the traffic police. The reflected radio wave travels faster than the emitted radio wave. This results in frequency difference between two waves. This difference is used to calculate the velocity of a vehicle.
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[v1] 2018-12-21 23:56:16
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