A) speed of the observer
B) distance between observer and source
C) speed of the source
D) frequency from the source
Correct Answer: B
Solution :
Dopplers effect is the apparent change in frequency or wavelength of a wave, that is perceived by an observer moving relative to the source of the waves. \[n={{n}_{0}}\left( \frac{v\pm {{v}_{0}}}{v\pm {{v}_{s}}} \right)\] where n is perceived frequency, \[{{n}_{0}}\] is original frequency, \[{{v}_{0}}\] is velocity of observer and \[{{v}_{s}}\]that of source For waves such as sound waves that propagate in a wave medium, the velocity of the observer and the source are reckoned relative to the medium in which the waves are transmitted. The total Dopplers effect may therefore result from either motion of the source or motion of the observer. Hence, it does not depend upon the distance between the observer and the source.
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