1.

A person feels 2.5% difference of frequency of a motor-car horn. If the motor-car is moving to the person and the velocity of sound is 320 m/sec, then the velocity of car will be                     [CPMT 1981; MP PET 1989]

A.            8 m/s (approx.)                   
B.            800 m/s
C.            7 m/s                                       
D.            6 m/s (approx.)
Answer» B.            800 m/s


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