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A sound detector D moves with constant s...

A sound detector D moves with constant speed on a circle or radius R and centre at O in xy plane. A point source of sound S lines in xy plane at a distance 2R from the point O and emits sound of a given frequency . The ratio of maximum frequency and minimum frequency recorded by the detector is `11/9` and speed of sound is 340 m/s . the minimum time interval in seconds between recording a maximum frequency and minimum frequency is (take R = 17)

A

`1:2`

B

`1:3`

C

`1:1`

D

`2:3`

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The correct Answer is:
B
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