Homework Answers
(a)
Pressure reflection coeffient: it is the ratio of amplitude of reflected wave to amplitude of incident wave.
In significates that how much of an electromagnetic wave is reflected by an impedance discontinuity in the transmission medium.
(b)
It is given as,
Here, p is the sound pressure of the sound wave and po is the reference sound pressure.
(C)
Intensity transmission coefficient is the ratio of amplitude of transmitted wave to amplitude of incident wave at a discontinuity in transmission line.
Transmission coefficient describe the relative amplitude or power of transmitted wave compare to indident wave.
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A plane wave in fresh water with a sound pressure level of 95 dB is normally...
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A plane wave at 2,000 Hz has a sound intensity level of 75 dB. What is Prms in Pa? d. 3.6x10 5.1x10-1 f. None of the above a. 3.6x10-2 b. 1.1x10-1 c. 2.3x10-1 e. 0. A plane wave at 1,050 Hz in air at room temperature has a sound intensity level of 60 dB. What is the wavelength in ft? a. 0.27 b. 0.33 d. 0.90 1.07 e. c. 0.78 f. None of the above
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A sound wave has an intensity level of 123.5 dB in air. The density of air at 20.0°C is ρ = 1.20 kg/m3. The speed of sound in air at 20.0°C is v = 343 m/s What is the pressure amplitude of the wave? in N/m2
Ē"(z)= 2a e 3x104) 1) A uniform plane wave is incident normally on an air-sea water...
Ē"(z)= 2a e 3x104) 1) A uniform plane wave is incident normally on an air-sea water interface at z=0. The phasor expression of the incident electric field intensity is: (V/m) The parameters of the sea-water are: E = 80€, (F/m), u = H (H/m)and o = 4(S/m). Find: a) The intrinsic impedance of medium (1) and medium (2). b) The reflection and transmission coefficients. c) The attenuation and phase constants in the second medium. d) The ratio of the sea-water...
6) If a plane wave is reflected from the ocean floor with a 15 dB reduction in amplitude angle of incidence of 30°, what are the possible values of the specific fluid bottom material if it has a...
6) If a plane wave is reflected from the ocean floor with a 15 dB reduction in amplitude angle of incidence of 30°, what are the possible values of the specific fluid bottom material if it has a speed of sound of 1666m/s? at an acoustic impedance of the 7) Calculate the amplitude and phase of the reflection coefficient for a plane wave incident on a sediment with density 1200 kg/m', sound speed 1700 m/s at an angle of incidence...
Problem 3: A uniform plane wave at frequency f is normally incident from the left on...
Problem 3: A uniform plane wave at frequency f is normally incident from the left on the following structure. All materials are non-magnetic (Pr1). Region 3: Er3 Region 1: Region 2: Ey2 Ert d A. Determine the thickness d that will causemaximum reflection 5 Points B. Determine the Effective Coefficient of Reflection 5 Points C. Determine find the percentage of power transmitted through the structure. 5 Points D. Determine the thickness d that will cause minimum reflection 5 Points Problem...
A 85.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The...
A 85.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 85.0-Hz sound wave?
1. If the sound intensity of a sound wave doubles, what is the change in dB?...
1. If the sound intensity of a sound wave doubles, what is the change in dB? If the sourd intensity level (in dB) increases by 5 dB, what is the change in the sound intensity? (15 pts)
A 72.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The...
A 72.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 72.0-Hz sound wave? Answer in nm
1. A sound has an RMS pressure of 19.7 Pa, Determine the sound pressure level in dB?
1. A sound has an RMS pressure of 19.7 Pa, Determine the sound pressure level in dB? 2. A sound has an intensity of 0.38 W/m2, calculate the SPL in dB?
3. A perpendicular-polarized plane wave is incident at an angle 0, - 20P from plastic (?...
3. A perpendicular-polarized plane wave is incident at an angle 0, - 20P from plastic (? 4e, , ? Ho) to a region of free space. Find the angle of transmission Find the value of the reflection coefficient ?? . Find the value of the transmission coefficient ? Find the critical angle, defined as the angle of incidence ?, at which the a) . c) angle of transmission becomes ?.-900
A plane wave at 2,000 Hz has a sound intensity level of 75 dB. What is Prms in Pa? d. 3.6x10 5.1x10-1 f. None of the above a. 3.6x10-2 b. 1.1x10-1 c. 2.3x10-1 e. 0. A plane wave at 1,050 Hz in air at room temperature has a sound intensity level of 60 dB. What is the wavelength in ft? a. 0.27 b. 0.33 d. 0.90 1.07 e. c. 0.78 f. None of the above
A plane wave at 2,000...
Ē"(z)= 2a e 3x104) 1) A uniform plane wave is incident normally on an air-sea water interface at z=0. The phasor expression of the incident electric field intensity is: (V/m) The parameters of the sea-water are: E = 80€, (F/m), u = H (H/m)and o = 4(S/m). Find: a) The intrinsic impedance of medium (1) and medium (2). b) The reflection and transmission coefficients. c) The attenuation and phase constants in the second medium. d) The ratio of the sea-water...
6) If a plane wave is reflected from the ocean floor with a 15 dB reduction in amplitude angle of incidence of 30°, what are the possible values of the specific fluid bottom material if it has a speed of sound of 1666m/s? at an acoustic impedance of the 7) Calculate the amplitude and phase of the reflection coefficient for a plane wave incident on a sediment with density 1200 kg/m', sound speed 1700 m/s at an angle of incidence...
Problem 3: A uniform plane wave at frequency f is normally incident from the left on the following structure. All materials are non-magnetic (Pr1). Region 3: Er3 Region 1: Region 2: Ey2 Ert d A. Determine the thickness d that will causemaximum reflection 5 Points B. Determine the Effective Coefficient of Reflection 5 Points C. Determine find the percentage of power transmitted through the structure. 5 Points D. Determine the thickness d that will cause minimum reflection 5 Points Problem...
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