Source and observer both start moving simultaneously from origin, o...

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Source and observer both start moving simultaneously from origin, one along \( \mathrm{x} \)-axis and the other along \( y \)-axis with speed of source \( = \) twice the speed of observer. The graph between the apparent frequency
\( \mathrm{P} \) observed by observer \( f \) and time \( t \) would approximately be :
(A)
(B)
\( (\mathrm{C}) \)
(D)
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