Relativity and Cosmology


Double Slit Interference and Doppler Effect

Authors: Eric Su

The double-slit interference shows that the product of the wavelength and the distance from the slit plate to the projection screen is conserved in all inertial reference frames. This conservation ensures that the observed wavelength in any inertial reference frame is identical to the original wavelength in the rest frame of the light source. According to the Doppler effect, the observed frequency depends on the choice of inertial reference frame. With the same wavelength but different frequency, the speed of light is different in a different inertial reference frame.

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Submission history

[v1] 2019-06-20 00:05:36
[v2] 2019-07-01 21:37:20
[v3] 2019-07-15 15:03:16

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