When a source moves in any direction, the source strength and the frequencies are altered by the Doppler effect. It is shown that the source strength divided by the cube of the frequency is a Lorentz invariant.
CITATION STYLE
Johnson, M. H., & Teller, E. (1982). Intensity changes in the Doppler effect. Proceedings of the National Academy of Sciences, 79(4), 1340–1340. https://doi.org/10.1073/pnas.79.4.1340
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