A band playing music at a frequency u is moving towards a wall at a speed vb. A motorist is following the band with a speed v m . If v is the speed of sound, the expression for the beat frequency heard by the motorist is
Text Solution
Verified by ExpertsThe correct answer is:
C
The motorist receives two sound waves : direct one and that reflected from the wall.
For direction sound waves,
For reflected sound waves,
Frequency of sound wave reflected from the wall
Frequency of the reflected waves as received by the moving motorist
Beat frequency 
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