Homework Answers
The STL is in dB.
Transmission coefficient, Itronsmitted lindidend = 0.02 : sound transmission loss, STL = 10 log (4) = 10 log (%0.02) STL = 16.99 - flow; given the incidend sound intensity level is to do. 70 = 10 log ( I nedent); Io - 10-12 W/m2 - Incident = 10 - Incident = 10-12 x 107 W/m2 = 10-5 W/m² I transmitted 0.02x Iincident = 0.02 x 10-5 level - = 2 x 10-7 W/m2 This corresponds to sound intensity ß = 10log, (It smitted =10 logo ( 24.02 = ß = 53.01 dB . To
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11. What is the sound tran Heat is the sound transmission loss of a wall whose...
13. What is the transmission coefficient of a wall whose sound transmission loss is 30 dB?...
13. What is the transmission coefficient of a wall whose sound transmission loss is 30 dB? What would be the sound intensity of a sound after passing that wall, if its intensity entering the wall was 2x10 watt/mº?
What is the overall transmission loss of a wall (12 mx 3 m) that has two...
What is the overall transmission loss of a wall (12 mx 3 m) that has two doors (1 mx 22 m each) if the transmission loss of the wall and the doors are 40 dB and 20 dB respectively? Show all steps
What is the sound intensity level B, in deabels, of a sound wave whose intensity is...
What is the sound intensity level B, in deabels, of a sound wave whose intensity is 10 times the relerence intensity e I Express the sound intensity namerically to the nearest integer 101)? Review 1 Constants1 Periodic Tabla View Available Hints) Learning Goal: To understand the decbel scale The decbel scale is a logaithmic scalo for measuring the sound intonsity level Because the decibel scale is ogarithmic, it changes by an additive constant when the intensity as measurod in W/m...
11. The sound level in decibels (dB) is given by dB-10log(101x), where x is the intensity of the sound given in W/c...
11. The sound level in decibels (dB) is given by dB-10log(101x), where x is the intensity of the sound given in W/cm2. a) Determine the sound level in dB for a sound having an intensity of 2 x 1012 W/cm b) What would be the sound level in dB if the sound intensity were doubled?
11. The sound level in decibels (dB) is given by dB-10log(101x), where x is the intensity of the sound given in W/cm2. a) Determine the...
4. What is the intensity of a sound whose sound level is 25 dB? We were...
4. What is the intensity of a sound whose sound level is 25 dB? We were unable to transcribe this image
What is the level of a sound whose intensity is 1.6 x 10-6 W/m2? (Io =...
What is the level of a sound whose intensity is 1.6 x 10-6 W/m2? (Io = 1 x 10-12 W/m2) A person standing a certain distance from an airplane with four equally noisy jet engines is experiencing a sound level of 137 db. What would this person experience if the captain shut down all but one engine?
1. The speed of sound in an alcohol at a temperature of 20°C is 1260 m/s....
1. The speed of sound in an alcohol at a temperature of 20°C is 1260 m/s. The density of the alcohol at that temperature is 650 kg/m^3. At a temperature of 20°C, find the bulk modulus of the alcohol. 1030 MPa 1080 MPa 1140 MPa 1190 MPa 1240 MPa 2. During a thunderstorm, you hear the sound 4 s after you see the lightning flash. How far did it fall? Assume the temperature outside is approximately 20 1.324 km 1.372...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 w (a) Find the intensity 10.7 m from the source W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? Need Help? Read 11. -/2 points SerCP10 14 P023 My No A commuter train passes a passenger platform at a constant speed of 42.1 m/s. The...
5. The threshold of human hearing at a frequency of 1.0 kHz is usually defined to...
5. The threshold of human hearing at a frequency of 1.0 kHz is usually defined to be exactly 0 dB (for purposes of significant figures, consider this to be an exact, pure number). A research study shows that if exposed to 95 dB of a sound source for a long time, the threshold of hearing will shift upward to 32 dB. This accounts for why it is hard to hear normal conversations for some time after leaving a loud concert....
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 W (a) Find the intensity 10.7 m from the source. 0.76 Your response differs from the correct answer by more than 100%, w/m? (b) Find the intensity level in decibels at that distance. 118.8 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation Cary out all inter to...
13. What is the transmission coefficient of a wall whose sound transmission loss is 30 dB? What would be the sound intensity of a sound after passing that wall, if its intensity entering the wall was 2x10 watt/mº?
What is the overall transmission loss of a wall (12 mx 3 m) that has two doors (1 mx 22 m each) if the transmission loss of the wall and the doors are 40 dB and 20 dB respectively? Show all steps
What is the sound intensity level B, in deabels, of a sound wave whose intensity is 10 times the relerence intensity e I Express the sound intensity namerically to the nearest integer 101)? Review 1 Constants1 Periodic Tabla View Available Hints) Learning Goal: To understand the decbel scale The decbel scale is a logaithmic scalo for measuring the sound intonsity level Because the decibel scale is ogarithmic, it changes by an additive constant when the intensity as measurod in W/m...
11. The sound level in decibels (dB) is given by dB-10log(101x), where x is the intensity of the sound given in W/cm2. a) Determine the sound level in dB for a sound having an intensity of 2 x 1012 W/cm b) What would be the sound level in dB if the sound intensity were doubled?
11. The sound level in decibels (dB) is given by dB-10log(101x), where x is the intensity of the sound given in W/cm2. a) Determine the...
4. What is the intensity of a sound whose sound level is 25 dB? We were unable to transcribe this image
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 w (a) Find the intensity 10.7 m from the source W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experience the sound at the threshold of pain, 120 dB? Need Help? Read 11. -/2 points SerCP10 14 P023 My No A commuter train passes a passenger platform at a constant speed of 42.1 m/s. The...
An outside loudspeaker (considered a small source) emits sound waves with a power output of 111 W (a) Find the intensity 10.7 m from the source. 0.76 Your response differs from the correct answer by more than 100%, w/m? (b) Find the intensity level in decibels at that distance. 118.8 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation Cary out all inter to...
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