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Experiment P36 Resonance Modes and the Speed of Sound 实验P36共振模式和声音的速度.doc
Teacher’s Guide - Activity P45: Resonant Modes and the Speed of Sound (Voltage Sensor, Power Output) Concept DataStudio ScienceWorkshop (Mac) ScienceWorkshop (Win) Waves P45 Speed of Sound 2.DS P36 Speed of Sound P36_MACH.SWS Equipment Needed Qty Equipment Needed Qty Voltage Sensor (CI-6503) 1 Resonance Tube (WA-9612) 1 Patch Cords (SE-9750) 2 What Do You Think? The speed of sound can be determined by various methods. How can you calculate the speed of sound in a column of air inside a tube? Take time to answer the ‘What Do You Think?’ question(s) in the Lab Report section. Background For a given frequency of sound in a resonance tube, there are a variety of tube lengths at which a standing wave will be formed. Likewise, for any given tube length, there are a variety of resonant frequencies—frequencies at which standing waves will be formed in the tube. In general, if the sound frequency is many times higher than the lowest resonant frequency (the fundamental frequency) for the tube, there will be several nodes and antinodes in the standing wave. For an open tube, the distance between successive antinodes in a standing wave is one-half wavelength. The speed of sound is the product of the wavelength and the frequency, or where v is the speed of sound, ? is the wavelength, and f is the frequency. SAFETY REMINDER Follow all safety instructions. For You To Do Use the ‘Output’ feature of the interface to drive a speaker to vibrate the air inside a Resonance Tube at a fixed frequency (1000 Hz). Use DataStudio or ScienceWorkshop to control the speaker’s output frequency with the Signal Generator. Use a microphone mounted in the Resonance Tube to measure the amplitude of sound. Use the Voltage Sensor to measure the signal from the microphone. Use a piston inside the tube is used to adjust the length of the column of air inside the tube. Use the software to display the output signal of the speaker, and the input signal from the microphone. Change the position of t
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