The Speed of Sound Using Resonance in a "Closed Tube"This is a featured page

In this experiment, we are to determine the speed of sound using resonance in a closed tube, with an open pipe. The equation to find the speed of sound is frequency (Hz) multiplied with the wavelength (λ). In this experiment, it is necessary to locate the two resonance point using a closed tube (with an open pipe) to find out the speed of sound. A resonance point is the point in which the loudest sound is created through the vibration of particles due to the increase in amplitude. A closed tube is just like a cylinder; one side is sealed and the other side is open to pour in liquid. Open pipe in this experiment is a hard, white plastic pipe that has both of the ends opened.

To begin the experiment, water was added to the closed tube and the open pipe was placed into the tube. In this experiment, the tuning fork with 426.7 Hz and a green rubber object were needed too. Firstly, knock the tuning fork against the green rubber object, and then hold the tuning fork close to the open pipe. The open pipe will be needed to move up and down to find the point that created the loudest sound using the tuning fork, that point is called the resonance point. (NOTE: The bottom of the open pipe may never go above water when finding the resonance point. If the pipe is too short, then attach another pipe with it.) After finding the first resonance point, measure it, then attach another pipe to find the next resonance point up and measure it. In the experiment, the first resonance point is 20, and the second one was 60, and between the two resonance points is 40. Two resonance points only makes half a wavelength, to find the full wavelength, you will need to double the number. If half a wavelength is 40, then one whole wavelength would be 80. Therefore, now the numbers are all calculated; the frequency and the wavelength. Frequency is 426.7 Hz, and the wavelength is 80 cm. In scientific calculations, all centimeters are converted to meters. Therefore, it would make the wavelength be 0.8 m.

Lastly, to calculate the speed of sound, you will need to multiply the frequency with the wavelength (427.6*0.8), which gives out the answer is 341.36. Therefore, according to this experiment, the speed of sound is 341.36 m/s.


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