A motor car blowing a horn of frequency 120 vib/s moves with velocity 90km/hr. The frequency of the sound heard (Reflected) by the driver will be (speed of sound in air is 325 m/s)
109 vib/s
132 vib/s
140 vib/s
248 vib/s
frequency of sound when source is moving towards the observer and observer is moving away from source -
- wherein
Speed of sound
Speed of observer
speed of source
Original frequency
apparent frequency
Option 1)
109 vib/s
This is incorrect
Option 2)
132 vib/s
This is incorrect
Option 3)
140 vib/s
This is correct
Option 4)
248 vib/s
This is incorrect
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