An air-filled pipe is found to have successive harmonics at 775 Hz, 1085 Hz, and 1395 Hz . It is unknown whether harmonics below 775 Hz and above 1395Hz exist in the pipe. What is the length of the pipe?


For string or light waves, the ends will be fixed points.
Determine known values: length of the tube or string, frequency, wavelength, and positions of nodes or antinodes.
It is an open closed tube.

For sound waves in a open-closed tube, the allowed frequencies and wavelengths are given by

lambda = 4L/m
f = m(v/4L) = mf
m = 1,3,5,7,..

What is the length of the pipe?

Answer rating: 100% (QA)

Successive harmonic frequencies f 775 Hz f 1085 Hz f ... View the full answer