In the above siltuation, bus is at rest blowing horm of frequency f_(0). A boy is at rest at some distance. What will be apparent frwuecy of sound,

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In the above siltuation, bus is at rest blowing horm of frequency f_(0). A boy is at rest at some distance. What will be apparent frwuecy of sound, if the air star moving with the speed of 20 m/s from bus towards boy?

A. ltf_(0)
B. gtf_(0)
C. =f_(0)
D. None of these

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