The loss in a cable is usually defined in decibels per kilometer (dB/km). If the signal at the beginning of a cable with -0.3 dB /km has a power of 2 mW, what is the power of the signal at 5 km?

Q: A man hears his echo from a nearby hill 2 seconds after he shouted. If the frequency of his voice is…

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Q: The low-frequency speaker of a stereo set has a surface area of 0.06 m2 and produces 1 W of…

A: Given :      Surface area, A1  = 0.06 m 2      Power, P = 1 W     Intensity, I = 0.24 Wm2

Q: A typical sound level for a buzzing mosquito is 35 dB, and that of a vacuum cleaner is approximately…

A: Given, sound level for a buzzing mosquito=35dB sound level for vacuum cleaner=65dB

Q: The density of a muscle is 1.3 g/cm3 and the sound velocity in it is 1.5 km/s. The acoustic…

A: Density, ρ = 1.3 g/cm3 = 1.3×103 kg/m3 Velocity, v = 1.5 km/s = 1500 m/s

Q: The intensity at a certain location is 1.021 W/m2. What is the sound intensity level at this…

A: Intensity of sound at a certain location (I) = 1.021 Wm2

Q: How far must one stand from a 4 mW point sound source if the intensity at that location is at the…

A: Given, Power = 4mW

Q: Sound Power Level, Lw is measured as the total acoustic power emitted by a source in all directions…

A: Given:reference value of power, Po = 10-12 Wpower emitted by the siren, P = 2TU Where T = 9 and U =…

Q: Image the blood's speed? [No That i

A: The reflected wave dropper shift as,

Q: A sound wave having a frequency of 253 Hz travels through air at 20 °C. The decibel level at a…

A: Given  Distance r1=32.2 m β1=77.1 dB r2=32.2-14.1=18.1 m

Q: (a) What is the intensity in watts per meter squared of a just barely audible 200-Hz sound? (b)…

A: At bare minimum audible level for a given frequency is plotted in the figure below,     The formula…

Q: The smallest change in sound level that can be detected by a person with normal hearing is 1 dB.…

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Q: A source of sound (1000 Hz) emits uniformly in all directions. An observer 2 m from the source…

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Q: What is the decibel level of a sound that is three times as intense as a 83.2 dB sound? (b) What is…

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Q: How many times a minute does a boat bob up and down on ocean waves that have a wavelength of 38.0 m…

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Q: An individual can hear sound waves from 20 Hz to 20 kHz. If the speed of sound is 340 m/s, what is…

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Q: a) Find the size of the smallest detail observable in human tissue with 50.5 MHz ultrasound. (Use…

A: In this question we have to find the  size of the smallest detail, the effective penetration depth…

Q: A 100 milliwatt signal is sent over a 1 km long cable, which attenuates the signal 0.04 dB/meter.…

A: Given : Power of signal sent over 1km, Pi = 100 mW Attenuation per meter, k = 0.04 dB/m 1km = 1000 m…

Q: I The loudness, L, in decibels(dB), is given by the formula L = 10 • log where l = 10-1² W/m². The…

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Q: 10-9. The following noise spectrum was obtained from a jet aircraft flying overhead at an altitude…

A: Your answer is 108dB

Q: Problem 1: An audio engineer takes decibel readings at distances of r = 14 m and r, = 22 m from a…

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Q: The average depth of penetration of an ultra-sound wave of the frequency f = 800 kHz in tissue is 4…

A: Given The initial intensity of the wave is I0=10 W/m2. The skin depth or average depth of…

Q: 10 m from a speaker sound intensity level 60 dB.  (a) What is the power of the speaker? (b) What is…

A:

Q: Two students hear the same sound and their eardrums receive the same power from the sound wave. The…

A: Given; Let there be two students A and B.  Both receives the same power from sound wave i.e. PA =…

Q: With the installation of noise suppression materials, the noise level in an auditorium was reduced…

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Q: Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low…

A: Sound intensity level = β = 85.1 dB Diameter of the speaker = d = 15.5 cm = 15.5 cm×1 m100 cm=0.155…

Q: Find the intensity level in decibels for sound with intensity 2.4 times 10 to the negative 6 power…

A: The level of sound or loudness may be expressed in decibels above the standard threshold of hearing…

Q: An echo returned in 2s. What is the distance of the reflecting surface from the source, given that…

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Q: How far must one stand from a 2.2 mW point sound source if the intensity at that location is at the…

A: Given Data : The power of the point source is given as P = 2.2mW.

Q: The sound intensity level of 9 m from a large power saw is 89 dB. At what distance(in meters) will…

A: (given) Sound intensity level at distance (r1)= 9 m Power saw β1 = 89 dB More tolerable intensity…

Q: How far must one stand from a 3.8 mW point sound source if the intensity at that location is at the…

A: The threshold intensity for the human ear is 0 DB. that means intensitt is  I = 1.0 x 10-12 w/m2 .

Q: mplified through a sound system the amplified sound has a sound intensity level that is 12.2 dB…

A: We have givenA sound system the amplified sound has a sound intensity level that is 12.2 dB greater…

Q: How to convert 0.5 µW to dBSIL? (1 W = 1 000 000 µW).

A: Given thatdB=10 logPoutPindBSIL=?Pin=10-12 W/m2Pout=0.5 μ W/m2 As,  1μ W=10-6 Wso, Pout=5×10-7 W/m2

Q: A small source emits sound waves with a power output of 95 W. Take I0 = 1 x 10-12 W/m2. Find the…

A: Given : Sound wave's power →P=95 W Initial intensity →I0=1×10-12 W/m2 Distance →r=700 cm=7 m Sound…

Q: Sound with intensity larger than 120 dB appears painful to a person. A speaker delivers 280 W of…

A: Given information: Sound intensity level painful to a person SIL=120 dB. Audio output of a speaker…

Q: Q:A- Calculate the sound level in dB of a sound intensity 10-8 Wm-2

A:

Q: The motion detectors used in our labs are ultrasonic, operating at 25,000 Hz.  In a lab room where…

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Q: What is the speed of sound in (m/s) in a medium where a 156 KHZ frequency produces a 3.282 cm…

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Q: what would its intensity level have to be to reduce the intensity by a factor of 2.40?

A: Explanation and final answer is in next step.

Q: The fundamental frequency of a closed pipe is 200Hz. What is the frequency of first overtone?

A: The fundamental frequency of a closed pipe,