An old mining tunnel disappears into a hillside. You would

Chapter 17, Problem 17.92

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An old mining tunnel disappears into a hillside. You would like to know how long the tunnel is, but its too dangerous to go inside. Recalling your recent physics class, you decide to try setting up standing-wave resonances inside the tunnel. Using your subsonic amplifier and loudspeaker, you find resonances at 4.5 Hz and 6.3 Hz, and at no frequencies between these. Its rather chilly inside the tunnel, so you estimate the sound speed to be 335 m/s. Based on your measurements, how far is it to the end of the tunnel?

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