Relativity and Cosmology


Standing Wave And Doppler Effect

Authors: Eric Su

The harmonic mode of standing wave requires the number of nodes to be conserved in all inertial reference frames. The half wavelength is proportional to the width of the microwave cavity. The same cavity width is observed by all stationary observers in the same inertial reference frame. All observers observe the same wavelength from the standing wave in a moving cavity. According to the Doppler effect, the observer will detect a higher frequency if the microwave cavity is approaching. The observer will detect a lower frequency if the microwave cavity is receding. With the same wavelength but different frequency, the speed of microwave in the standing wave is different for different observer.

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[v1] 2019-06-08 01:22:53

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