Consider a pipe with a length of 57.5 cm. If the temperature of the air is 21.5degrees C and the pipe is closed in one end and open in the other, what is the frequency of the third harmonic for the pipe? Post your answer in hertz (Hz) and with 3 significant figures.

Answer 1

http://hyperphysics.phy-astr.gsu.edu/hbase/Sound/souspe.html

frequency closed end pipe

Answer 2

remember wavelength = speed of sound * T = speed of sound / f
and then
http://www.physicsclassroom.com/class/sound/Lesson-5/Open-End-Air-Columns