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A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. He reports hearing two successive resonances at 50.5 Hz and 59.5 Hz. How deep is the well?

A typical sound level for a buzzing mosquito is 37 dB, and that of a vacuum cleaner is approximately 67 dB. Approximately how many buzzing mosquitoes will produce a sound intensity equal to that of a vacuum cleaner?

How far, and in what direction, should a cellist move her finger to adjust a string's tone from an out-of-tune 446 Hz to an in-tune 440 Hz? The string is 68.0 cm long, and the finger is 21.9 cm from the nut for the 446-Hz tone.

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