Question

Suppose you used a 300 Hz tuning fork to produce resonant frequency in a tube whose diameter is 3.0 cm. At what length of the tube will you the resonant frequency if the air temperature inside the tube is 25 C. Assume that the tube is closed at one end.

did it the first time
https://www.jiskha.com/display.cgi?id=1511047418#1511047418.1511048268
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