1.

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  [MP PET 2002]

A.            \[\frac{1}{10}v\]                 
B.            \[\frac{1}{2}v\]
C.            \[\frac{1}{5}v\]                   
D.            v
Answer» B.            \[\frac{1}{2}v\]


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