TeachMeFinance.com - explain doppler effect (aka Doppler shift)
doppler effect (aka Doppler shift) The term 'doppler effect (aka Doppler shift)' as it applies to the area of Earth observation can be defined as ' The apparent change in frequency of sound or light waves, varying with the relative velocity of the source and the observer. If the source and observer draw closer together, the frequency is increased. Named for Christian Doppler, Austrian mathematician and physicist (1803-1853)'.
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