SOLVED:A car moving at 20  m / s with its horn blowing (f=1200  Hz) is chasing another car going at 15  m / s in the same direction. What is the apparent frequency of the horn as heard by the driver being chased? Take the speed of sound to be 340  m / s. This is a Doppler problem. Draw the observer-to-source arrow; that's the positive direction. Both the source and the observer are moving in the negative direction. Hence, we use -uo and -vs fo=fs (v ±vo)/(v ∓vs)=(1200  Hz) (340-15)/(340-20)=1.22
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