Which of these statements describes a Doppler shift?
A) change in velocity of a wave as it passes the interface of two materials with different densities
B) change in wavelength of a wave as it passes the interface of two materials with different densities
C) change of a frequency of an emitted wave due to relative motion of a source and an observer
D) change of perceived frequency of a wave according to an observer due to relative motion of a source and the observer
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