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

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