Reflection of a Sound-Ware from a Circular Plate

Abstract

A train of plane sound-waves was made to fall normally upon a circular plate and reflectcd, the distribution of intensity on the normal axis was ealcu- lated raider a few assumptions, and comp tied it with accurate experiments. The experiments were performed in a sound-proof chamber, with two different plates and four diffarent pitches of sound. Near the plate we found interesting pheno- mena, namely that the envelope of standing waves, if the wavelength is smaller than the radius of the plate, has a maximum and a minimum, and that the interval between the maxima of standing waves is creator than half a wavelength. These facts were confirmed by theory