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A source and detector both start moving ...

A source and detector both start moving simultaneously from the position shown in the figure, one along x-axis and the other along y-axis with speeds 40 `ms^(-1)` and 30 `ms^(-1)` respectively. If n is the frequency of the source then the graph between the apparent frequency n' observed by detector and time t would be [assume that source and detector do not collide]

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