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11 p125 Speed of Sound May 2009 Crivello Resonance in Columns of Air

# 11 p125 Speed of Sound May 2009 Crivello Resonance in Columns of Air

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Physics 125-Resonance in Columns of Air 1 SAN DIEGO MESA COLLEGE Name_________________________ PHYSICS 125 LAB REPORT Date __________Time___________ Partners ______________________ TITLE: Resonance in Columns of Air ______________________________ ______________________________ ______________________________ Objective: To determine the speed of sound in air and to measure the frequency of an unknown tuning fork. Theory: The normal modes of vibration of an air column with one fixed end have the property that the fixed end is a location of a node (location of vanishing longitudinal motion) while the open end is an antinode. As a result, the number of wavelengths λ that fits into the length of the column is equal to ¼, ¾, 5 / 4 .... for the fundamental, the second, and the third harmonics, etc. The corresponding frequency satisfies the relation v f = λ (1) where v is the speed of sound in air. Resonance with the modes occurs if a tuning fork of the right frequency is struck and held near the open end. If the length L of the air column is varied while the vibrating tuning fork is held near the open end, a resonance can be detected as a loud hum. The change in air column length

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11 p125 Speed of Sound May 2009 Crivello Resonance in Columns of Air

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