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TA Presentation

# 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 λ = m=6 L λ = m=4 5 / 4 L λ = m=5 3 / 4 L λ = m=3 / 4 L λ = m=1 4 v f m L = (page 2)