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?
- 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!