A sound wave having a frequency of 288 Hz travels through air at 20 °C. The decibel level at a distance of 33.5 m from the source is measured to be 76.8 dB. What is the dB level at a position that is 16.3 m closer? Assume the density of air is 1.20 kg/m³ and that the source produces spherical wave fronts.
Q: Two speakers (A and B) lie on the y-axis, 4.0m apart. They emit exactly the same 280 Hz tone in…
A: speed of the sound v = 340 m/s Ferquncy (f) = 280 Hz
Q: A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity…
A: The sound intensity level experienced by the crew member,
Q: You are trying to overhear a juicy conversation, but from your distance of 15.0 m, it sounds like…
A: Solution: Given that distance 1; R1 = 15 m whisper 1; dB1 = 2 dB sound levelI is the intensity of…
Q: You are trying to overhear a juicy conversation, but from your distance of 21.0 m, it sounds like…
A: Write the expression for sound intensity level.
Q: You are watching a live music show, and at the location of the stage, where all the speakers are…
A:
Q: You are trying to overhear a juicy conversation. But when you are a distance of 25.0 m away from the…
A:
Q: A Jackhammer from 1 meter away produces roughly 100dB of sound. What is the sound pressure caused…
A: Write the expression for loudness
Q: You are watching a live music show, and at the location of the stage, where all the speakers are…
A:
Q: Speakers A and B are vibrating in phase. They are directly facing each other, are 1.33 m apart, and…
A: distance between the two speakers = 1.33 m frequency = 715 Hz speed of sound = 345 ms
Q: What is the decibel level of a sound that has an intensity of 57.5 x 10-5 W/m2? Assume the…
A: The sound intensity is The reference intensity is Find:Sound level for given sound intensity.
Q: You work at a building site and the noise level has been measured at 95 dB. You need to wear…
A:
Q: A 3.00 m long air column is open at both ends. The frequency of a certain harmonic is 410 Hz, and…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: A rock group is playing in a bar. Sound emerging from the door spreads uniformly in all directions.…
A: Write the expression for the initial sound intensity level and substitute the corresponding values…
Q: You are at BNA (Nashville Airport) watching commercial airliners take off. At a distance of 1,357.1…
A: Given L1=1357.1m, β1=71.52dB β2=87.85dB L2=?
Q: Problem 6. The low-frequency speaker of a stereo set has a surface area of 0.05 m² and produces 1 W…
A: Given: A=0.05 m2P=1 W
Q: Problem 1: An audio engineer takes decibel readings at distances of r = 14 m and r, = 22 m from a…
A:
Q: An audio engineer takes decibel readings at distances of r1=11m and r2=23m from a concert stage…
A: Part (a) Sound level is given by: β= 10*log (I1/I0) β = Sound level of at r1 distance from speaker =…
Q: An audio engineer takes decibel readings at distances of r1 = 15 m and r2 = 21 m from a concert…
A:
Q: You are trying to overhear a juicy conversation, but from your distance of 21.0 m, it sounds like…
A:
Q: truck is moving at 33 m/s, and a car in front of the truck is moving in the same direction at 43…
A: Speed of source = vs = 33 m/s Speed of observer vo = 43 m/s Original frequency = 193 Hz
Q: In addition to producing images, ultrasound can be used to heat tissues of the body for therapeutic…
A: We have to determine weather the standing waves are created. Given that, L=0.55 cmfm=0.70 MHz
Q: Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The…
A: Here is your solution -
Q: A open end tube will set up a standing sound wave when there is an antinode at both ends of the…
A:
Q: One method for measuring the speed of sound uses standing waves. A cylindrical tube is open at both…
A: Given: frequency (f) = 433 Hz Length ( L) = 0.243 m
Q: You are watching a live music show, and at the location of the stage, where all the speakers are…
A: Given:- The intensity of the sound is I = 469.92 mW/m2. The distance from the stage of the person…
Q: An audio engineer takes decibel readings at distances of r1 = 13 m and r2 = 21 m from a concert…
A:
Q: A 38.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at…
A: The frequency of the sound wave is f=38.0 Hz The sound intensity level is L=60 dB The density of air…
Q: After years of being alone and never getting a single phone call, Daniel understandably forgets to…
A:
Q: Problem 4. A point source emits sound waves uniformly in all directions. At distance 90.0 m from the…
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Q: A person standing 1.10 m from a portable speaker hears its sound at an intensity of 3.90 x 10-³…
A: Given Distance from speaker ( d ) = 1.10m sound intensity ( I1 ) = 3.90 x 10-3 W/m2 ( a ) decibal…
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- A noisy factory machine produces a sound intensity of 1.00 x 10-5 W/m2 when measured 10 m from the machine. Assume that the sound spreads out uniformly into 3 dimensions for this set of questions. What is the sound power output of the machine? (Give your answer in mW.) What is the decibel level of the machine at 10 m? At what distance is the decibel level equal to 55 dB? (Give your answer in m.)Two speakers emit sound waves of different frequencies as shown in the figure: Speaker A has a power of 1.00 mW and Speaker B has a power of 1.50 mW. A 4.00 mi В 3.00 m 2.00 m (2.6 when speaker B is turned on at point c, how many dB ls the sound level at point C ,Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 27 m away from the sound source is 3.0 X 10-4 W/m2. What is the intensity at a spot that is 80 m away?
- A safety technician measures the sound volume level inside the office of the engineer supervising the and calculates L1=72 dB. As an excavator is working outside the office, he again measures the volume level and finds L2=86 dB. What is the sound volume level of the excavator alone within the office space?You and your roommate decide to throw a party. You rig up three speakers with a combined decibel level of 83.5 db. You know that speaker one is 78.0 dB and speaker 2 is 76.0 dB. The sticker on the back of speaker 3 is missing, so you will have to calculate how many decibels it is. How many decibels is the third speaker?Ac was held on an open field. You and your friends were there at the time and were 20 m away from the speaker. (a)How much intensity of sound would you here if the speaker has a 15,000 W of power and is used at its full capacity? (b)According to National Institute on Deafness and Other Communication Disorders, long or repeated exposure to sound at or above 85 decibels can cause hearing loss. With this information, at least how much more should you and you friend move from your current position to prevent any hearing damages?
- A sound wave having a frequency of 266 Hz travels through air at 20 °C. The decibel level at a distance of 21.3 m from the source is measured to be 77.4 dB. What is the maximum displacement of air molecules at that location? Assume the density of air is 1.20 kg/m³ and that the source produces spherical wave fronts. Express the displacement as a number having the units of mirco meters. 1 micro meter = 1 x 10-6 m. For example, If your calculated answer were 1.873 x 10-7 m, your entry would be the number 0.187 7.13Sound waves travel at roughly 340 m/s at room temperature. The minimum hearing range of a human is 20Hz. a) What is the wavelength of this wave? b) Could this wavelength fit inside the dimensions of Room 411( room dimensions are roughly 11.5 m x 8.7 m)? Justify your answer with sound reasoningA physics professor demonstrates the Doppler effect by tying a 450 HzHz sound generator to a 1.0-mm-long rope and whirling it around her head in a horizontal circle at 100 rpm. What is the difference between the highest frequency heard by a student in the classroom and the initial frequency of the sound generator?
- You are at BNA (Nashville Airport) watching commercial airliners take off. At a distance of 1,020.6 away from the plane, you record a sound intensity level of 73.4 decibels. If you move such that the new sound intensity level is 88.07 decibels, how far are you away from the plane (in meters)?You are at BNA (Nashville Airport) watching commercial airliners take off. At a distance of 1,364.2 away from the plane, you record a sound intensity level of 69.31 decibels. If you move such that the new sound intensity level is 91.34 decibels, how far are you away from the plane (in meters)?At a distance of 9.00 m from a tornado warning siren you measure the sound intensity to be 133. dB. If a level of 80.0 dB is the lowest acceptable level for effective warning, what is the range of this siren in m?