A sounding fork whose frequency is `256 Hz` is held over an empty measuring cylinder. The sound is faint , but if just the right amount of water is poured into the cyclinder , it becomes loud. If the optimal amount of water produce an air column of length `0.31 m`, then the speed of sound in air to a first approximation isA. `317 m//s`B. `371 m//s`C. `340 m//s`D. `332 m//s`

A sounding fork whose frequency is `256 Hz` is held over an empty meas

1.	A sounding fork whose frequency is `256 Hz` is held over an empty measuring cylinder. The sound is faint , but if just the right amount of water is poured into the cyclinder , it becomes loud. If the optimal amount of water produce an air column of length `0.31 m`, then the speed of sound in air to a first approximation isA. `317 m//s`B. `371 m//s`C. `340 m//s`D. `332 m//s`
Answer» Correct Answer - A `f_(closed) = (v)/(4 l)` `256 = (v)/( 4 (0.31))` `v = 317.44 m//s`

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