Determining the distance of a pipe by the length of an echo

[workinprogres]

How could I determine the length of a pipe by playing a certain frequency into it, then measuring how long the echo is audible?

 

[Glen Bartusch]

How could I determine the length of a pipe by playing a certain frequency into it, then measuring how long the echo is audible?

Identify the time interval between the emission of the transmitted sound (frequency-independent; ensure your transmitted sound is a discreet click rather than a long, continuous soundwave for ease of calculation) and it's return echo. The pipe is assumed to be measueable in feet less than 5280 (or one mile); sound travels at around 1467 feet/sec. Divide your time interval by 1467, then divide that answer by 1/2 (remember, the sound wave travels twice the distance of your pipe, hence the reason for the second division by 1/2) to arrive at your answer.