Compared to sound, what is generally required for the Doppler shift in light to be easily detected by instruments?
Answer
A significant fraction of the speed of light
Because the speed of light is vastly higher (approximately $3.0 imes 10^8$ meters per second) than the speed of sound (around 343 meters per second), measurable light shifts usually require extremely high velocities.
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Doppler Effect - How Motion Changes Sound Frequency - YouTube
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