In Fig. 17-38, sound with a 40.0 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r that results in an intensity minimum at the detector? Figure 17-38 Problem 22.
In Fig. 17-38, sound with a 40.0 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r that results in an intensity minimum at the detector? Figure 17-38 Problem 22.
In Fig. 17-38, sound with a 40.0 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r that results in an intensity minimum at the detector?
A sound wave propagating in air has a frequency of (7.86) kHz Calculate the change in wavelength when the wave, initially traveling in a region where T = (27.35}°C, enters a region where T = (5.99)°C.
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
The intensity of a sound source is described by an inverse-square
law only if the source is very small (a point source) and only if the
waves can travel unimpeded in all directions. For an extended
source or in a situation where obstacles absorb or reflect the waves,
the intensity at distance r can often be expressed as
I = cPsource/r, where c is a constant and the exponent î, which
would be 2 for an ideal spherical wave, depends on the situation. In
one such situation, you use a sound meter to measure the sound
intensity level at different distances from a source, acquiring the
following data:
Distance, r (m)
1
3
10
30
100
Intensity level, ß (dB)
100
93
85
78
70
Part A
You want to determine the exponent a for this sound source by graphing the data. Select the appropriate variables to graph on each axis that will produce a straight-
line graph with either a slope or intercept that will allow you to determine x.
Sort all variables into the appropriate bins.
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