169 years after its discovery, Doppler effect found even at molecular level

Whether they know it or not, anyone who’s ever gotten a speeding ticket after zooming by a radar gun has experienced the Doppler effect – a measurable shift in the frequency of radiation based on the motion of an object, which in this case is your car doing 45 miles an hour in a 30-mph zone.

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169 years after its discovery, Doppler effect found even at molecular level