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if you have a standing wave in a long pipe of length 2.90m and that is closed on the left end and open on the right end and the graph of it is as below, with x-axis the position along pipe and y-axis vertical air displacement

http://i2.photobucket.com/albums/y7/twiztidmxcn/plot.gif

i found the harmonic number to be 5, but that was by guessing at a wavelength

i now need to find frequency using the speed of sound in air as 344m/s

i used the harmonic number and the equation L = (2n-1)*wavelength / 4, pluggin in my length of 2.9m and 5 for n, and then divide 344 by that number

i have gotten a multitude of numbers, including 266.86Hz, but nothing has worked

any help in the right direction would be much appreciated

thx-twiztidmxcn