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Jessica, that sounds like a fun project. What are the learning goals for this activity? What are you hoping that students will take away from it?
BTW, there are a number of free decibel meter apps available.
Oh, I just thought of a quick extension, as long as they've got their decibel meters handy: Have them see how the sound intensity level various with distance from the source. Does it depend on the intensity level of the source? Do the measurements agree with what you'd expect theoretically, i.e., an inverse square law?
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