Crossword Genius

Discoverer of the effect of relative speed on the observed frequency of waves (7)

Ross

I believe the answer is:

doppler

(Other definitions for doppler that I've seen before include "Change focus rapidly" , "--- shift, frequency change with speed" , "Physicist associated with frequency shifts" , "Light, sound frequency shift physicist" , "Austrian physicist, d. 1853 famous for his discovery of the effect of movement on perceived wavelengths" .)

I've seen this clue in The Times.
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