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TA Presentation - MP1 Speed of Sound in Air PHY 257 In this...

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MP1 Speed of Sound in Air PHY 257 In this lab we will carry out the following tasks: (page 1) a. Measure the frequencies of standing waves in a plexiglass tube open at both ends and then in a tube open at one end and closed at the other. From these data we will calculate the speed of sound in air b. Map the amplitude of a particular standing wave as function of distance inside the tube for the open-open and open-closed case c. Measure the amplitude of a particular standing wave in a tube open at both ends as function of frequency. From there data we will determine the Quality factor (Q-factor) of the tube for that mode.
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Standing Sound Wave in a Tube Pressure amplitude waves two open ends one closed end /2 L λ = m=2 3/ 2 L = m=6 L = m=4 5/ 4 L = m=5 4 L = m=3 /4 L = m=1 4 v fm L = (page 2)
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Section V-2: Standing waves in an open-open tube. In this section you monitor the microphone output as you are slowly increasing the frequency f oo of the signal generator output. The easiest method is to use the oscilloscope. The standing wave frequencies occur when the microphone output is maximum. The frequencies are given by the equation: Here m is an even integer (2,4,…), v is the speed of sound in the tube, and L is the
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This note was uploaded on 10/20/2011 for the course EE 257 taught by Professor staff during the Spring '11 term at SUNY Buffalo.

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TA Presentation - MP1 Speed of Sound in Air PHY 257 In this...

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