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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 b h d d h i b d d l d 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 ill d i h Q li f (Q f ) f h b f h 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 / 4 L / 2 L m=2 m=1 L m=4 3 / 4 L m=3 3 / 2 L m=6 5 / 4 L m=5 4 v f m L (page 2)
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