Sound (speed = 343 m/s) exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. A person is sitting at an angle α off to the side of a diffraction horn that has a width D of 0.070 m. This individual does not hear a sound wave that has a frequency of 11000 Hz. When she is sitting at an angle of α/2, the frequency that she does not hear is different. What is this frequency?

Two audio speakers are placed on a vertical rail. Speaker A is placed at head-level while Speaker B is place at some variable height, Ay, above Speaker A. Both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.467 meters. Calculate the lowest height that Speaker B can be placed above Speaker A to produce a minimum of sound heard by person standing Ax = 6.03 meters directly in front of Speaker A. Image size: s ML Max ay AX

A violin string 17.9 cm long and fixed at both ends oscillates in its n = 4 mode. The speed of waves on the string is 229 m/s, and the speed of sound in air is 348 m/s. What are (a) the frequency and (b) the wavelength of the emitted sound wave?

An enclosed chamber with sound-absorbing walls in Chamberlin Hall has a 2.0m x 1.0m opening for an outside window. A loudspeaker is located outdoors,  87 m away, and facing the window. The intensity level of the sound entering the window space from the loudspeaker is 79 db. Assume the acoustic output of the loudspeaker is uniform in all directions and that the acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window. The threshold of hearing is 1.0 x 10 -12 W/m2. What is the acoustic power entering through the window space