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A small source of sound moves on a circl...

A small source of sound moves on a circle of radius r with constant speed `V_s`. `eta` is the actual frequency of the source. For the positions of the source indicated in the figure find the frequency as heard by three observers at the points P,O & Q respectively

Text Solution

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Here, `eta_1=eta{V/(V-V_s cos theta)}`
(a) At P `theta=pi//4 " " therefore eta_0=eta{V/(V-(V_s//sqrt2))}`
(b)At O `theta=pi//2 " " therefore eta_0=eta `
(c ) At S `theta=(3pi//4) " " therefore eta_Q=eta {V/(V+(V_s//sqrt2))}`
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