Question

Closed-end organ pipes often have a movable closure that can be adjusted up or down to tune the pipe to the desired pitch. The resonant length of a certain closed-end pipe is 27.2 cm. By how many centimeters must this pipe be shortened or lengthened in order to tune it to a fundamental frequency of 342 Hz? The pipe is in an environment in which the speed of sound is 341 m/s.