The octave-band sound-pressure-level data generated by an electric shaver in the presence of random background noise versus band center frequencies are as follows: Hz SPL (dB) 63 60 125 60 250 59 (a) What is the total SPL value in dB? (b) What is the total SPL value in dBA? 500 60 1000 2000 60 58 4000 50 8000 45

The octave-band sound-pressure-level data generated by an electric shaver in the presence of random background noise versus band center frequencies are as follows: Hz SPL (dB) 63 60 125 60 250 59 (a) What is the total SPL value in dB? (b) What is the total SPL value in dBA? 500 60 1000 2000 60 58 4000 50 8000 45

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter14: Superposition And Standing Waves

Section: Chapter Questions

Problem 49P: Some studies suggest that the upper frequency limit of hearing is determined by the diameter of the...

See similar textbooks

Similar questions

Problem 3: The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0 dB.Randomized Variables β = 45 dB If the student hears a sound at 45 dB, what is the intensity of the sound?Numeric : A numeric value is expected and not an expression.I = __________________________________________ Problem 4: A student exchanges the stock headphones (β1 = 87 dB) for her mp3 player for a new set that is louder (β2 = 95 dB). If the first set produced a power of P1 = 0.5 W how much power does the new set produce, P2 in W?Numeric : A numeric value is expected and not an expression.P2 = __________________________________________
A washing machine has a sound intensity of 20 W/m2, determine its RMS sound pressure in Pa? The sound pressure of the noise emitted from a centrifugal compressor is 300 Pa, what is the resulting sound pressure level (dB) Calculate the total sound pressure level of multiple sound sources: 55 dB, 68 dB, 25 dB, and 50 dB The noise level in a factory with 12 identical machines running is 80 dB. At night, the factory must comply with local noise regulation not to exceed 75 dB. How many machines can be used at the night shift
Problem 5: The softest sound a human ear can hear is at 0 dB (Io = 10-12 W/m2). Sounds above 130 dB cause pain. A particular student's eardrum has an area of A = 56 mm2.Randomized Variables A = 56 mm2 Part (a) What is the most power, in watts, the ear can receive before the listener feels pain?Numeric : A numeric value is expected and not an expression.Pmax = __________________________________________Part (b) What is the smallest power, in watts, the ear can detect?Numeric : A numeric value is expected and not an expression.Pmin = __________________________________________
10-9. The following noise spectrum was obtained from a jet aircraft flying overhead at an altitude of 250 m. Compute the equivalent A-weighted sound level using sound power level addition in a spreadsheet program you have written. INTRODUCTION TO ENVIRONMENTAL ENGINEERING Band center Band level frequency (Hz) (dB) 125 85 250 88 500 96 1,000 100 2,000 104 4,000 101
An interface is formed between a block of aluminium (with an acoustic impedance of 1.8 x 107 kg m2 s') and a block of copper (with an acoustic impedance of 4.6 x 107 kg m-2 s-1). Longitudinal sound waves travelling through the aluminium are normally incident on the boundary, and are partially reflected. a) What is the ratio of the amplitude of the reflected wave to that of the incident wave? Number b) What is the ratio of the amplitude of the transmitted wave to that of the incident wave? Number c) What percentage of the incident power is transmitted? Number d) What percentage of the incident power is reflected? Number % Ouit P Sove Questi
1) Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a 90.0-dB sound intensity level for a 12.0-cm-diameter speaker that has an efficiency of 100%. (This value is the sound intensity level right at the speaker.)
Design a 5th order active filter showing all the design steps, assumptions made and necessary calculationsThe threshold frequency = 12kHz.The speaker is supposed to reject all sounds having a frequency below a certain threshold which is 12kHz
An 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 = __________________________________________
An 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 = __________________________________________Part (b) How much power P, in watts, is coming from the speaker during the sound check at distance r1?Numeric : A numeric value is expected and not an expression.P = __________________________________________Part (c) Assuming that the speaker output does not change between the two measurements at r1 and r2, what sound intensity level β2, in decibels, will the loudness meter report when the engineer is at…
Problem 6: An audio engineer takes decibel readings at distances of r1 = 14 m and r2 = 25 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 = 110 dB on his loudness meter.Randomized Variables r1 = 14 mr2 = 25 mβ1 = 110 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 = __________________________________________Part (b) How much power P, in watts, is coming from the speaker during the sound check at distance r1?Numeric : A numeric value is expected and not an expression.P = __________________________________________Part (c) Assuming that the speaker output does not change between the two measurements at r1 and r2, what sound intensity level β2, in decibels, will the loudness meter report when the…
The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0 dB.Randomized Variablesβ = 25 dB If the student hears a sound at 25 dB, what is the intensity of the sound?Numeric : A numeric value is expected and not an expression.I = __________________________________________
The area of a typical eardrum is about 5.0x10−5 m2. What is the sound power (energy per second) incident on the eardrum at the threshold of hearing? What is the sound power (energy per second) incident on the eardrum at the threshold for pain?