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demonstrations:3_oscillations_and_waves:sound_waves:interference_with_two_sound_sources:start
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demonstrations:3_oscillations_and_waves:sound_waves:interference_with_two_sound_sources:start [2019/04/25 21:20] demoroom |
demonstrations:3_oscillations_and_waves:sound_waves:interference_with_two_sound_sources:start [2020/02/20 20:40] demoroom |
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| ====== Interference With Two Sound Sources ====== | ====== Interference With Two Sound Sources ====== | ||
| - | {{tag> oscillations_and_waves speakers interference acoustics repair unlocated}} | + | {{tag> oscillations_and_waves speakers interference acoustics unlocated}} |
| <WRAP box right> | <WRAP box right> | ||
| Line 13: | Line 13: | ||
| Consists of a pair of speakers hooked up to the amplifier and a function generator. | Consists of a pair of speakers hooked up to the amplifier and a function generator. | ||
| - | **NOTE: Last time we tried this demo, we failed to get consistently noticeable results. Needs testing in the lecture hall.** | ||
| ===== Purpose ===== | ===== Purpose ===== | ||
| Line 33: | Line 32: | ||
| - Test the speakers to check if the polarity is right (they only work one way) | - Test the speakers to check if the polarity is right (they only work one way) | ||
| - Select a frequency on the function generator and turn up the volume on the stereo | - Select a frequency on the function generator and turn up the volume on the stereo | ||
| - | - A frequency of about 1000 or 2000 Hz gives noticeable pattern although superimposed on the interference pattern are the nodes and antinodes from standing waves produced by reflection in the lecture theater. | ||
| - The table (or cart) can be turned so that any interference pattern produced in the direction of the speakers can be swept across the audience producing audible maxima and minima. | - The table (or cart) can be turned so that any interference pattern produced in the direction of the speakers can be swept across the audience producing audible maxima and minima. | ||
| ===== Notes ===== | ===== Notes ===== | ||
| + | In the new Hebb theater (as of 2020), a frequency of 600 Hz with three feet of separation between the speakers seems to show a noticeable effect. | ||
| <WRAP group> | <WRAP group> | ||
demonstrations/3_oscillations_and_waves/sound_waves/interference_with_two_sound_sources/start.txt ยท Last modified: 2020/03/13 20:57 by demoroom
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