Open and Closed Tubes - that the exact point at which a...

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OPEN AND CLOSED TUBE RESONATORS (CYLINDERS) By convention a rigid cylinder that is open at both ends is referred to as an "open" cylinder; whereas, a rigid cylinder that is open at one end and has a rigid surface at the other end is referred to as a "closed" cylinder. The first three resonances in an open cylindrical tube. The horizontal axis is pressure. The first three resonances in a closed cylindrical tube. The horizontal axis is pressure. Open Open cylindrical tubes resonate at the approximate frequencies where n is a positive integer (1, 2, 3...) representing the resonance node, L is the length of the tube and v is the speed of sound in air (which is approximately 343 meters per second at 20 °C and at sea level). A more accurate equation considering an end correction is given below:
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