1.

A motor car blowing a horn of frequency 124vib/sec moves with a velocity 72 km/hr towards a tall wall. The frequency of the reflected sound heard by the driver will be (velocity of sound in air is 330 m/s)                      [MP PET 1997]

A.            109 vib/sec                            
B.            132 vib/sec
C.            140 vib/sec                            
D.            248 vib/sec
Answer» D.            248 vib/sec


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