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The tuning forks of frequencies 320 Hz a...

The tuning forks of frequencies 320 Hz and 340 Hz produce sound waves of wavelength differing by 6 cm in air. The velocity of sound in air is

A

`426.4 m//s`

B

`326.4 m//s`

C

`300 m//s`

D

`250 m//s`

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