Two small speakers emit sound waves of different frequencies equally in all directions. Speaker A has an output of 0.700 mW, and speaker B has an output of 1.90 mW. A 4.00 m| В 3.00 m 2.00 m (a) Determine the sound level (in decibels) at point C assuming only speaker A emits sound. 73.4 dB (b) Determine the sound level (in decibels) at point C assuming only speaker B emits sound. 91.3 dB (c) Determine the sound level (in decibels) at point C assuming both speakers emit sound. 91.3 dB

Two small speakers emit sound waves of different frequencies equally in all directions. Speaker A has an output of 0.700 mW, and speaker B has an output of 1.90 mW. A 4.00 m| В 3.00 m 2.00 m (a) Determine the sound level (in decibels) at point C assuming only speaker A emits sound. 73.4 dB (b) Determine the sound level (in decibels) at point C assuming only speaker B emits sound. 91.3 dB (c) Determine the sound level (in decibels) at point C assuming both speakers emit sound. 91.3 dB

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter17: Traveling Waves

Section: Chapter Questions

Problem 74PQ

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(a) What is the speed of sound in a medium where a 100-kHz frequency produces a 5.96-cm wavelength? (b) Which substance in Table 17.1 is this likely to be?
(a) What is the speed of sound in a medium where a 100kHz frequency produces a 5.96cm wavelength? (b) Which substance in Table 17.1 is this likely to be?
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A trumpet creates a sound intensity level of 1.15 102 dB at a distance of 1.00 m. (a) What is the sound intensity of a trumpet at this distance? (b) What is the sound intensity of five trumpets at this distance? (c) Find the sound intensity of five trumpets at the location of the first row of an audience, 8.00 m away, assuming, for simplicity, the sound energy propagates uniformly in all directions. (d) Calculate the decibel level of the five trumpets in the first row. (e) If the trumpets are being played in an outdoor auditorium, how far away, in theory, can their combined sound be heard? (f) In practice such a sound could not be heard once the listener was 2-3 km away. Why cant the sound be heard at the distance found in part (e)? Hint: In a very quiet room the ambient sound intensity level is about 30 dB.
A trumpet creates a sound intensity level of 1.15 102 dB at a distance of 1.00 m. (a) What is the sound intensity of a trumpet at this distance? (b) What is the sound intensity of five trumpets at this distance? (c) Find the sound intensity of five trumpets at the location of the first row of an audience, 8.00 m away, assuming, for simplicity, the sound energy propagates uniformly in all directions. (d) Calculate the decibel level of the five trumpets in the first row. (e) If the trumpets are being played in an outdoor auditorium, how far away, in theory, can their combined sound be heard? (f) In practice such a sound could not be heard once the listener was 2-3 km away. Why cant the sound be heard at the distance found in part (e)? Hint: In a very quiet room the ambient sound intensity level is about 30 dB.
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