A source of sound of frequency 512 Hz is...

A source of sound of frequency 512 Hz is placed inside water. The speed of sound in water is `1482 m s^(-1)` and in air it is `320 m s^(-1)` . The frequency of sound recorded by an observer who is standing in air is

A

206 Hz

B

3000 Hz

C

120 Hz

D

512 Hz

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