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A man sitting on a swing which is moving...

A man sitting on a swing which is moving to an angle of `60^(@)` from the vertical is blowing a whistle which has frequency of `2.0` KHZ. The whistle is `2.0` m from the fixed support point of the swing. A sound detector which detects the whistle sound is kept in front of the swing. The maximum frequency the sound detector detected is :

A

2.027 kHz

B

1.974 kHz

C

9.74 kHz

D

1.011 kHz

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The correct Answer is:
A
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