Range of human hearing, Interference (three ways), Relationship of frequency and size. Lots of different investigations with sound are possible. Here are a few that I do as labs or demonstrations with my high school physics classes.

Step 1: Stuff You Need

Not much is needed for this.

1. Computer (with Audacity and Visual Analyser)
2. Microphone
3. Speakers
5. Water bottle (and water)
Great post! I have changed the setting for my computer speakers to sound like an auditurm but forget how ot change it back got any suggestions?
Is there any way to do waveshaping in audacity? Maybe a plugin or anything? Goldwave had a nice graphical one. . .
I've tried the 18,000 Hz with the family and only my little brother could hear it. then my sister brought her baby in the room while she was sleeping, and I turned it on to see if there would be any effect. she woke up very alarmed and in a state of panic I haven't seen before.
if you have a dog try it with it. i tried if i could hear it but i cant he he he
Very Good instructable! I learned a lot. I am making a cell phone ringer for teens.
if you can just barely hear it thnk of how bad it is for the dog! yeah, might wanna turn it down so you cant hear it and see if te dog still goes away... i reckon it'd work
17,000 Hz seems to be enough to get my annoying dog to go away. Lucky for me, I can just barely hear it.

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