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"It's a miracle. When I took a look at my very moldy old 45 rpm record that my college singing group recorded almost a half-century ago, I thought I'd never be able to hear our golden voices again (including the fact that I no longer have a record player). But I sent you the record figuring that the worst you would do is send it back to me with ..."

Acoustic phase constant

The imaginary part of the acoustic propagation constant. The commonly used unit is the radian per second or unit distance.