Question

solve this its imp.​

Answer 1

Answer:

the answer is option number 4.

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Answer 2

ANSWER

The path difference between the sound waves reaching the point P via  path (1) and (2) is  Δx

∴    Δx=πr−2r=(π−2)r

For maximum amplitude (i.e constructive interference) to occur at P        Δx=nλ              

lambda=v/frequency

(π-2)r=$\frac{nv}{v*\\}$

v*=nv/(pi-2)r