a vertical tube, open at both ends, is lowered into a tank of water until it is

Question

a vertical tube, open at both ends, is lowered into a tank of water until it is partially filled. the top portion of the tube, above the water, is filled with a gas that, because it is denser than air, remains in the tube. a 50.2--long, 1.10 horizontal wire is stretched just above the top of the tube with 456 of tension. bowing the wire at its center causes the wire to vibrate at its fundamental frequency. the water level in the tube is adjusted until the sound from the vibrating wire sets up a standing sound wave in the gas. the water is then lowered another 32.5 until the next standing sound wave is detected. use this information to determine the speed of sound in the gas

Explanation / Answer

First calculate the natural frequency of the vibrating wire. Then recognize that the wavelength must be 32.0 cm for the sound reflection to create the same standing wave. speed of sound = wavelength X frequency

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