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Nine tuning forks are arranged in order ...

Nine tuning forks are arranged in order of increasing frequency . Each tuning fork produces 4 beats per second when sounded with either of its neighbours. If the frequency of the 9th tuning fork is twice that of the first, what is the frequency of the first tuning fork ?

A

`32 Hz`

B

`40Hz`

C

`48 Hz`

D

`56 Hz`

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