Abstract
Experimental data on the amplitude of transverse particle velocity associated with the (1,0) mode of rectangular tube for frequencies in the region of cutoff are presented. The distance decay from the source is exponential for frequencies investigated in the range f/fc⩽0.998 where f is the frequency of excitation and fc is the mode cutoff frequency. At cutoff, the amplitude drops to the fraction 1/e of its value at the source over a distance interval equal to about 8 times the tube width. For frequencies above f/fc = 1.01 the progressive wave pattern appears fully developed. Comparison data between theoretical and measured values of attenuation for frequencies below cutoff are also presented.
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