On this last day before a four-day weekend we talked about why and how sound waves interfere when their path lengths differ to a given spot. This is why the walls in auditoriums, music halls, or anything else where the sound quality matters are not smooth. If they were smooth, different sound waves from the same source might reflect off the walls and make it to the same point (listener) by paths of differing lengths, where they would interfere and make the volume weird.
PICTURE HERE - SOON
You don't have any real homework this weekend, but it would be nice (if you have a smartphone) if you could find and download an app that lets you produce sounds of known frequency - a frequency generator. There should be some free ones out there. This is for a lab I want to do next week (although probably not the day we get back).
I am also looking for buckets and PVC pipe (2-4 ft long) for that same lab. You would get those supplies back.
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