257-MP1 Intro Rev 2

257-MP1 Intro Rev 2 - MP1 Speed of Sound in Air PHY 257 In...

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MP1 Speed of Sound in Air PHY 257 In this lab we will carry out the following tasks: 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 se 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. (page 1)
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Standing Sound Wave in a Tube Pressure amplitude waves two open ends one closed end /2 L m=2 /4 L m=1 L m=4 3/ 4 L m=3 2 L m=6 5/ 4 L m=5 4 v fm L (page 2)
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Section V-1: In this section you measure the length of the tube, its radius R , and the air temperature T 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 gp p g frequencies occur when the microphone output is maximum.
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257-MP1 Intro Rev 2 - MP1 Speed of Sound in Air PHY 257 In...

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