Sliding section Receiver Speaker Figure P14.38

A sound wave enters the thin tube at P and exits at Q. Assume r = 0.41m and the wavelength is 1.86m. What is the smallest length d that results in destructive interference at Q?

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Sound with a 29 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle.  Part of the soundwave travels through the circle and rejoins the the rest of the wave which goes directly through the straight portion.  This rejoining results in interference.  What is the smallest radius r  (in cm) that results in an intensity minimum at the detector.  The maximum destructive interference will occur when the difference in the distance travelled by the two waves is 1/2 of a wavelength.  To solve this problem express the difference in the distance travelled by the two waves as a function of r and set this amount equal to 1/2 of a wavelength.

In the figure, two loudspeakers, separated by a distance of d1 = 2.87 m, are in phase. Assume the amplitudes of the sound from the speakers are approximately the same at the position of a listener, who is d2 = 4.20 m directly in front of one of the speakers. Consider the audible range for normal hearing, 20 Hz to 20 kHz. (a) What is the lowest frequency that gives the minimum signal (destructive interference) at the listener's ear? (b) What is the lowest frequency that gives the maximum signal (constructive interference) at the listener's ear? (Take the speed of sound to be 343 m/s.) di Speakers Listener dg- (a) Number i Units (b) Number i Units >

An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questi

Two sinusoidal waves travel in the same direction with the same amplitude A = 1 m, same wavelength >=0.25m, and speed v = 2 m/s.If the phase difference between the two waves is =π/3, then the resultant interference wave function is expressed as: y_res (x,t)=1.73sin (0.5mx-16nt+n/6) y_res (x,t)=0.86sin(8nx-16nt+n/6) Oy_re's (x,t)=0.86sin(0.5mx-16nt+n/6) Oy_res (x,t)=1.73sin(8nx-16nt+n/6)