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/1², where c is a constant and the exponent z, 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 z 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 z. Sort all variables into the appropriate bins. ▸ View Available Hint(s) B/(10 db) I log10 (1) Horizontal axis Vertical axis logio(r) Not used Reset Help
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/1², where c is a constant and the exponent z, 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 z 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 z. Sort all variables into the appropriate bins. ▸ View Available Hint(s) B/(10 db) I log10 (1) Horizontal axis Vertical axis logio(r) Not used Reset Help
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Transcribed Image Text: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.
► View Available Hint(s)
B/(10 db)
Horizontal axis
Submit
I log10 (1)
Vertical axis
r
log10 (r)
Not used
Reset
Review
Help
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