A sound meter records 95 dBA in a different location in the plant. What exposure time without hearing protection would be permitted in that location?
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A: Given that:3) Io=10-12 W/m2β=454) β1=87 dB, P1=0.5 W, β2=95 dB, P2=?
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Q: Problem 7: An audio engineer takes decibel readings at distances of r1 = 11 m and r2 = 25 m from a…
A: r1 = 11 mr2 = 25 mβ1 =103 dB
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A sound meter records 95 dBA in a different location in the plant. What exposure time without hearing protection would be permitted in that location?
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- Item 9 Learning Goal: To learn the properties of logarithms and how to manipulate them when solving sound problems. The intensity of sound is the power of the sound waves divided by the area on which they are incident. Intensity is measured in watts per square meter, or W/m². The human ear can detect a remarkable range of sound intensities. The quietest sound that we can hear has an intensity of 10-¹2 W/m², and we begin to feel pain when the intensity reaches 1 W/m². Since the intensities that matter to people in everyday life cover a range of 12 orders of magnitude, intensities are usually converted to a logarithmic scale called the sound intensity level 3, which is measured in decibels (dB). For a given sound intensity I, B is found from the equation ß = (10 dB) log (1). where Io = 1.0 × 10-¹2 W/m². Part A What is the value of log(1,000,000)? Express your answer as an integer. ► View Available Hint(s) The logarithm of x, written log(x), tells you the power to which you would raise 10…The motion detectors used in our labs are ultrasonic, operating at 25,000 Hz. In a lab room where the temperature is 30 °C, what is the wavelength of these waves? Answer in centimeters. Use 3 sig figs (which is 2 decimal places).At a recording station, a difference in time of arrival between p waves and s waves was observed to be 1.5 seconds. What is the approximate distance from the station at which the event occurred? Assume p wave velocity as 7.97 km/s and s wave velocity as 4.55 km/s.
- During ultrasound examination of a patient with spherocytosis, it was noted that 1 MHz signal after reflection from erythrocyte is determined by the detector as having a frequency 400 Hz higher. Find the rate of movement of erythrocyte. The speed of sound in blood is 1500 m/s.The intensity of sound high as a multiple of the average minimum threshold of hearing intensity is related to the decibel level D or loudness of sound according to I=10^D/10 (A) express 10^D/10 using radical notation 10^D/10= (B)The background noise level of a relatively quiet room has a decibel reading of 31. Find the intensity of this noise level round your answer to decimal places (C)a decibel reading of 132 is at the threshold of pain. if I2 is the intensity of the threshold and I1 is the intensity found and part B express or a show I2/I1 as a power of 10 I2/I1=10^ approximate the ratio(round your answer to two decimal places) _____x10^10An audio engineer takes decibel readings at distances of r1 = 15 m and r2 = 22 m from a concert stage speaker during a sound check. When he is r1 from the speaker, the engineer registers a decibel level of β1 = 103 dB on his loudness meter.Randomized Variablesr1 = 15 mr2 = 22 mβ1 = 103 dB Part (a) What is the intensity of the sound, I1, in watts per square meter, that is measured by the loudness meter when the engineer is a distance of r1 from the speaker?Numeric : A numeric value is expected and not an expression.I1 = __________________________________________
- The electrical power needed to operate a speaker in your audio system is 18.7 W. If this speaker has a circular opening with a radius of 0.0743 m and the average sound intensity at the opening is 22.1 W/m2, determine the ratio of sound output power Psound to electrical input power Pelectrical. Psound PelectricalDetermine the velocity of sound in mercury, which has a bulk modulus of 2.8 × 10^10 and a density of 1.36 × 10^4 kg/m³.Sound is detected when a sound wave causes the eardrum to vibrate (as shown). Typically, the diameter of the eardrum is about 8.4 mm in humans. When someone speaks to you in a normal tone of voice, the sound intensity at your ear is approximately 1.0 × 10-6 W/m2. How much energy is delivered to your eardrum each second?