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Anonymous
Anonymous asked in Science & MathematicsPhysics · 4 months ago

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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  • NCS
    Lv 7
    4 months ago
    Favorite 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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