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[Purplecat]

Cool sound from dropping a chunk of ice down a borehole

An explanation of why it makes such a great “pew” sound at the end. The cylindrical bore hole acts as a waveguide, in which acoustic waves travel. Waveguides reduce loss of energy in transmission, but the speed of the traveling waves in a waveguide (the group velocity) varies with frequency, with higher frequencies traveling faster. This phenomenon is known as dispersion. When the ice chunk hits the bottom, it produces sound over a broad range of frequencies; we hear the high frequencies first b…

Great first post on the BBS. We need more of this!