PIRA 3B40.20 Doppler Effect: Rotating Speaker Bar
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Pictures show demonstration used at the University
of Texas at Austin
- Start by selecting a desired frequency for hearing while the speaker bar is stationary.
- Then, manually rotate or oscillate the speaker bar at a constant rate.
- Compare the sound to the stationary orientation. Notice how inference patterns are generated when the bar is set to oscillate.
- The rotating speaker bar allows students to hear the effect of sound interference and demonstrates the Doppler effect.
- When the bar is set to oscillate and students are stationary, they will perceive different interference patterns.
- Connect the digital function generator to the speaker bar.
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