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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 [2020/03/13 20:57] (current) 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 located}} |
| <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 27: | Line 26: | ||
| ===== Setup ===== | ===== Setup ===== | ||
| - | - Place the speakers on a cart at least two feet apart. You will have to adjust this distance according to your frequency. | + | - Place the speakers on a cart at least two feet apart. You will have to adjust this distance according to your frequency |
| - | - Attach the function generator output to the Amplifier and connect the amplified outputs from the amplifier to the input at the back of the stereo labeled "Phono Right". | + | - Attach the function generator output to the Amplifier and connect the amplified outputs from the amplifier to the input at the back of the stereo labeled "Phono Right" |
| - Ensure the stereo is set to play the phono input | - Ensure the stereo is set to play the phono input | ||
| - | - Attach the two cables from the back of the stereo to the speakers as shown in the picture below | + | - Attach the two cables from the back of the stereo to the speakers as shown in the picture |
| - 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> | ||
| Line 54: | Line 52: | ||
| </WRAP> | </WRAP> | ||
| <WRAP tablewidth 100%> | <WRAP tablewidth 100%> | ||
| - | | **Location** | ---- | | + | | **Location** | T1 | |
| | **Maker** | Unknown | | | **Maker** | Unknown | | ||
| | **Current State** | Working | | | **Current State** | Working | | ||
demonstrations/3_oscillations_and_waves/sound_waves/interference_with_two_sound_sources/start.1556227221.txt.gz · Last modified: 2019/04/25 21:20 by demoroom
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