NEET Physics Waves Questions Solved

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A car sounding a horn of frequency 1000 Hz passes an observer. The ratio of frequencies of the horn noted by the observer before and after passing of the car is 11 : 9. If the speed of sound is v, the speed of the car is 

(1) 110v

(2) 12v

(3) 15v

(4) v

(1) nBefore=vvvcn and nAfter=vv+vc.n

nBeforenAfter=119=v+vcvvcvcv10

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