Source and observer both start moving simultaneously from origin one along x-axis an the other along y-axis with speed of source = 2 (speed of observer). The graph between the apparent frequency observed by observer (f) and time (t) would be: (Here, f0 = natural frequency of source) (dotted line indicates the original frequency)

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answer is B.

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Detailed Solution

At any instant,So, apparent frequency does not change with time. as they are going apart the apparent frequency is less than original frequency

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