A narrow column of 20C air is found to have standing waves at frequencies of 390 Hz,

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A narrow column of 20°C air is found to have standing waves at frequencies of 390 Hz, 520 Hz, and 650 Hz and at no frequencies in between these. The behavior of the tube at frequencies less than 390 Hz or greater than 650 Hz is not known.

a. Is this an open-open tube or an open-closed tube? Explain.

b. How long is the tube?

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