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- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
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H1-24. Speed Of Sound In Helium And Sulfur Hexafluoride
Purpose
To determine the speed of sound as a function of gas density.
Equipment
Oscillator, small loudspeaker, cardboard tube with cellophane, two microphones, microphone mixer, helium and sulfur hexafluoride tanks, oscilloscope, plastic bag, rods and clamps.
Setup Time
10 min.
Images
Description
Sound pulses passing along the tube encounter two successive microphones, and the oscilloscope measures the time interval between the arrival of the pulse at the two microphones. Having one end covered by thin plastic, the gas tube can be inverted to contain either light or heavy gases. The oscillator is set for a 40 Hz square wave; rhe microphones are 68 cm apart. Approximate values for the speed of sound obtained using this apparatus are: 340 m/s for air, 900 m/s for helium, and 120 m/s for sulfur hexafluoride.
References
Lecture Demonstration Record Sheet.
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See pagesh1. nature of sound
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See pagesh2. wave properties of sound
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See pagesh3. standing sound waves
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See pagesh4. music
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See pagesh5. the ear
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See pagesh6. the voice
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See pagesh1. nature of sound
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See pagesh2. wave properties of sound
-
See pagesh3. standing sound waves
-
See pagesh4. music
-
See pagesh5. the ear
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See pagesh6. the voice