11. The intensity of a sound produced by a point source decreases as the square of the distance from the source. Consider a riveter as a point source of sound and assume that the intensities listed in the Table are measured at a distance 1 m away from the source. What is the maximum distance at which the riveter is still audible? (Neglect losses due to energy absorption in the air.)
11. The intensity of a sound produced by a point source decreases as the square of the distance from the source. Consider a riveter as a point source of sound and assume that the intensities listed in the Table are measured at a distance 1 m away from the source. What is the maximum distance at which the riveter is still audible? (Neglect losses due to energy absorption in the air.)
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Transcribed Image Text:11. The intensity of a sound produced by a point source decreases as the square of the distance from the
source. Consider a riveter as a point source of sound and assume that the intensities listed in the Table are
measured at a distance 1 m away from the source. What is the maximum distance at which the riveter is still
audible? (Neglect losses due to energy absorption in the air.)
TABLE 12.1 Sound Levels Due to Various Sources (representative values)
Source of sound
Sound level (dB)
Sound level (W/cm²)
Threshold of pain
120
10-4
Riveter
90
10-7
Busy street traffic
70
10-9
Ordinary conversation
60
10-10
Quiet automobile
50
10-11
Quiet radio at home
40
10-12
Average whisper
20
10-14
Rustle of leaves
10
10-15
Threshold of hearing
10-16
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