A motor car blowing a horn of frequency 124 vib/sec moves with 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)
109 vib/sec
132 vib/sec
140 vib/sec
248 vib/sec
In the condition source and listener are at the same position i.e car
Doppler Effect in reflected sound -
- wherein
Speed of sound
Speed of car
Option 1)
109 vib/sec
This is incorrect
Option 2)
132 vib/sec
This is incorrect
Option 3)
140 vib/sec
This is correct
Option 4)
248 vib/sec
This is incorrect
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