A source is moving on a circle of radius...

A source is moving on a circle of radius 3m with constant angular velocity `omega = 5 rad s^(-1)`. If the observer is at a distance 5 cm from the centre of the circle, the time interval between the maximum and minimum frequency received by the observer is

`pi/5`

`2/5 cos^(-1) (3/4)`

`2/5 cos^(-1) (3/5)`

`2/5 sin^(-1) (3/5)`

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