WVC PHYS222 Winter 2019 Lab #7.docx - Air Column Resonance Max Stevens Luke Corbin ABSTRACT The purpose of this lab is to find how different frequencies

WVC PHYS222 Winter 2019 Lab #7.docx - Air Column Resonance...

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Air Column Resonance Max Stevens Luke Corbin 2/20/2019 ABSTRACT: The purpose of this lab is to find how different frequencies affect how often and at what distance resonance occurs in a tube. It is anticipated that there will be more points of resonance with higher frequencies. INTRODUCTION: Sounds are said to “resonate” when their waveforms overlap. This is also called constructive interference. At these points of resonance, the amplitude of the wave is larger and can be perceived as being louder. If there is only one frequency being played, that frequency will resonate at points where the reflected frequency overlaps with the source. In this experiment a tuning fork is held over a tube filled with water. As water is drained from the tube, the overlapping frequencies are constantly shifted till they align and resonate. This may occur multiple times in the tube depending on the wavelength of the source. The shorter the wavelength the more times they will overlap in the same length of tube.
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THEORY: First the formula to find the speed of sound in air using a given temperature is needed: v = 331 Eq. 1 Source: Textbook pg. 511 Where v is the speed of sound and Tc is the temperature of the air in °C. The speed of sound is also equal to: v = λf Eq. 2 Source: Lab Packet Where v is the speed of sound, λ is wavelength, and f is frequency. This is true because frequency is the number of waves that pass by a point in a given amount of time, and wavelength is the length of each of those waves, multiplying the number of waves per unit of time by the length of those waves, gives us the total length of wave that travels past a point in a second, which is speed.
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EXPERIMENT: To set up this experiment a tube connected via hose to an overflow tank was filled with water. The height of water in the tube could be manipulated by changing the height of the overflow tank.
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