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# Closed pipe question?

when you blow across the top of a soda bottle, it acts like a closed pipe. If the inside of the bottle is 0.150 m long, what is the fifth harmonic frequency?

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- NCSLv 74 months agoFavorite Answer
As you say, we have a closed-end pipe. So

f_n = n*v / 4L

where n is the harmonic number.

Let's assume the speed of sound is 343 m/s. Then

f_5 = 5*343m/s / 4*0.150m = 2860 Hz

to three significant digits.

Hope this helps!

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