Calculate the fraction of reflected ultrasound energy when ultrasound waves cross from soft tissue into fat if the acoustic impedance for soft tissue is 1.60 x 106 kg m-2 s-1 and for fat has the value 1.40 x 106 kg m-2 s-1

Q: The human ear can detect a minimum intensity of Io = 10-12 W/m2, which has a sound intensity of 0…

A: The expression for the intensity of sound is

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

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Q: A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies…

A: Increase in dB level, B2 - B1 = 30.0 dB The intensity picked up by the hearing aid, I1 = 3.9×10-10…

Q: Diagnostic ultrasound of frequency 3.06 MHz is used to examine tumors in soft tissue. (a) What is…

A: Given data:  Frequency (f) = 3.06 MHz = 3.06×106 Hz Speed of sound in air  = 343 m/s Speed of sound…

Q: e 30 m away is 100 dB. What is the sound intensity in W/m^

A: Given:- The distance d = 30 m  The level of sound of jet airplane  L = 100 dB  Find:-  The Sound…

Q: Calculate the minimum frequency fmin of ultrasound that will allow a technician to see details as…

A: Given Data: The wavelength of sound is, λ=0.350 mm The velocity of sound in tissue is, v=1540 m/s…

Q: An 8 hour exposure to a sound intensity level of 95.0 dB may cause hearing damage. What energy in…

A: Given Data The exposure of the sound is upto time period ∆t = 8 hr. The intensity level of the sound…

Q: An ultrasound machine can measure blood flow speeds. Assume the machine emits acoustic energy at a…

A: original frequency (f) = 2.2×106 Hz speed of wave in human tissue (v) = 1580 m/s speed of blood (v')…

Q: Calculate the reflected percentage of an ultrasound wave passing from human muscle into bone. Muscle…

A: Formula for reflected percentage of ultrasound wave,

Q: The sound intensity at a distance of 8.5 m from a siren is 9.5 x 10^-2 W / m^2 . Determine the total…

A: The equation for the radiated power by the sound source is Power = Intensity of the sound*Area

Q: What is the stretched length in DB?  Choices: 3.606 m 1.769 m 1.572 m 1.837 m What is the…

A: In this question, the K value of spring is not mentioned, also the mass of block A. So, I have…

Q: Calculate the reflected percentage of an ultrasound wave passing from human muscle into bone. Muscle…

A: Muscle has a typical density of ρ= 1.06 ✕ 103 kg/m3 bone has a typical density of 1.82 ✕ 103 kg/m3

Q: A sound wave from a siren has an intensity of 118.7 W/m2 at a certain point, and a second sound wave…

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Q: Sound waves travel at roughly 340 m/s at room temperature. The minimum hearing range of a human is…

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Q: An 8-hour exposure to a sound intensity level of 90.0 dB can cause hearing damage. How much energy,…

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Q: You work at a building site and the noise level has been measured at 95 dB. You need to wear…

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Q: A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under…

A: SONAR is a device used to detect and locate objects under water using ultrasonic waves. The speed of…

Q: You work at a building site and the noise level has been measured at 95 dB. You need to wear…

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Q: A microphone receiving a pure sound tone feeds an oscilloscope, producing a wave on its screen. If…

A: Given Data: The initial intensity of a sound is, Ii=2×10-5 W/m2 The amplitude increases the…

Q: You work at a building site and the noise level has been measured at 95 dB. You need to wear…

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Q: A typical sound level for a buzzing mosquito is 39 dB, and that of a vacuum cleaner is approximately…

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Q: A bat can detect small objects, such as an insect, whose size is approximately equal to one…

A: As we know that the wavelength is called to be the ratio of the speed of the wave to its frequency.…

Q: The low-frequency speaker of a stereo set has a surface area of 0.05 m2 and produces 1W of…

A: Given data The area of the surface is A=0.05 m2 The acoustical power is P=1 W The intensity at…

Q: An audio engineer takes decibel readings at a distance of r1= 11m and r2= 23m from a concert stage…

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Q: The higher frequency limit for human hearing is 22.8 kHz. If the air temperature is 33.3 °C, the…

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

A: Given that First Intensity I1 = 0.79 W/m2 Second intensity I2 = (1.18)(0.79) W/m2 = 1.18I1 Diameter…

Q: As a jet plane takes off, at 5.0 m the sound wave intensity is 100 W/m². An observer stands 120 m…

A: The given data we have: Sound intensity at 5 m from the plane: 100 W/m2 The objective is to…

Q: As discussed in the chapter, many species of bats find flying insects by emitting pulses of…

A: The distance from the bat to the object is 1 m. Therefore, the pulse will travel a total distance of…

Q: A bat is using echolocation to find insects at night. If the bat emits a high frequency chirp and…

A: Given, The bat emits a high frequency chirp and hears an echo 0.031 s later. Temperature of air is…

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: Although we can't hear them, the ultrasonic pulses are very loud. In order not to be deafened by the…

A: We have to determine the when the bat hears its echo. Given that the Bat is 1 m away from the…

Q: Diagnostic ultrasound of frequency 3.43 MHz is used to examine tumors in soft tissue. (a) What is…

A: Given that: Frequency of ultrasound, f=3.43MHz⇒3.43×106Hz Speed of sound in air, v0=343m/s Speed of…

Q: Two students are standing the same distance from the source of the sound. The first student receives…

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Q: The propagation speed of a continuous wave ultrasound is 1.76 m/sec using a 2 MHz transducer. You…

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Q: Doppler ultrasound uses ultrasound to measure blood flow velocities. Suppose that the device emits…

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Q: Two students are standing the same distance from a source of sound. The first student receives a…

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Q: An audio engineer takes decibel readings at distances of r1 = 13 m and r2 = 21 m from a concert…

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Q: Diagnostic ultrasound of frequency 3.89 MHz is used to examine tumors in soft tissue. (a) What is…

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Q: Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of…

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Q: A metal has a Young's modulus of 6.801 x 1010 N/m2. What is the speed of sound in a metal rod in the…

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Q: A loud vacuum cleaner outputs 1.5 mW of sound energy. What is the intensity of the sound wave 2.0…

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Q: The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the…

A: listening position icrease from23 dB to 61 dB

Q: What is the fundamental frequency for a 60 cm banjo string if the speed of waves on the string is…

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Q: Ultrasound probes can resolve structural details with sizes approximately equal to the wavelength of…

A:

Q: A Doppler blood flow meter unit emits ultrasound at 4.1MHz. What is the measured blood speed if the…

A: Given : f1=4.1 MHz f2=1.6 kHz Speed of ultrasound in human tissue=1540 m/s

Q: The intensity level in decibels is defined as 10 log10(I/I0), where I0 is a reference intensity…

A: Given data:  Intensity level in decibels dB = 10 log10(I/I0) Here I0 = 10-12 W/m2 The intensity of…