A person standing 1.15 m from a portable speaker hears its sound at an intensity of 6.70 ✕ 10−3 W/m2. HINT (a) Find the corresponding decibel level.   Don't confuse intensity with intensity level. Intensity is a physical quantity with units of watts per meter squared. Intensity level, or decibel level, is based on the logarithm of a ratio of intensities and gives an approximate measure of our perception of loudness. dB (b) Find the sound intensity (in W/m2) at a distance of 39.0 m, assuming the sound propagates as a spherical wave.   W/m2 (c) Find the decibel level at a distance of 39.0 m.

Q: A loudspeaker has a circular opening with a radius of 0.1308 m. The electrical power needed to…

A: radius of circular opening = 0.1308 m Electrical power needed to operate the speaker = 37.4 W Sound…

Q: A blue whale can emit sound at a sound intensity level of 188 dB. The typical human shout has a…

A: Sound intensity is a measure of the amount of sound energy that passes through a unit area in a unit…

Q: sound with a frequency of 144 kHz in a cave where the temperature is 28°C. Assume that air behaves…

A: GivenA bat emits a sound with a frequency,f=144 kHz in a cave where the temperature, T= 28°C.Speed…

Q: Problem 5. A typical adult ear has a surface area of 0.0021 m². The sound intensity during a normal…

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

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Q: Because the human ear is so sensitive to sounds, it can detect very small intensities.  The lower…

A: In this case, the intensity of a sound is given. And we need to calculate the sound level of the…

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: A sound wave has intensity I, measured in units W/m^2. Show how to convert this intensity, I, to dB.

A: Given:-  A sound wave has an intensity I. The unit of intensity is W/m2. Find:-  Show how to convert…

Q: A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the…

A: Given: The distance of the point from the source is 20 m. The sound level is 51 dB. The reference…

Q: A person standing 1.05 m from a portable speaker hears its sound at an intensity of 4.30 ✕ 10−3…

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Q: The decibel level of a sound is defined to be $100 (7) B= 10 log where I is the intensity of the…

A: A train horn with a decibel rating ofwith a radius of.We need to find the intensity of the train…

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

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Q: The bulk modulus and the density of a liquid is B = 584 MPa and ρ = 1,027 kg/m3, respectively. What…

A: Given data: bulk modulus B = 584 MPa.   Density of liquid (ρ0) =1027 kg/m3.

Q: Move away from a sound source, from distance r, to r₂ = 2₁. (A) By what factor does the intensity…

A: Intensity  is inversely proportional to the square of the distance from the source. β = 10 logI/I0 β…

Q: According to the Guinness Book of Records, the anechoic chamber at Orfield Laboratories in…

A: Write the expression for the noise reading. Here, I represents the intensity of noise and I0…

Q: A source of sound has an intensity I1 and when its sound level is measured at a fixed distance the…

A: The initial sound intensity of the source is The final sound intensity of the source is The…

Q: A typical adult ear has a surface area of 2.1×10-3m2. The sound intensity during a normal…

A: Area, A = 2.1×10-3 m²Intensity, I = 3.2×10-6 W/m²Power, P = ?

Q: Loudness (L), in decibels (dB), of a sound of intensity I is defined to be L=10log(I)/(I_(0)) ,…

A: Let IT denotes the intensity of the trombone and LT denotes the loudness of the trombone. Using the…

Q: A sound wave arriving at your ear is transferred to the fluid in the cochlea. If the intensity in…

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Q: What is the intensity (in nW/m² or 10-9 W/n² )of a sound that is 10.8 dB higher than a 6.7*109 W/m²…

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Q: The table gives an estimate for the sound intensity of a whisper at 1.0 m. What is the sound…

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Q: at what distance from the factory (in km) is the intensity level of the whistle sound equal to 12…

A: Given, Factory whistle can be heard up to a distance, D=1.1Km=1100m Threshold of human hearing,…

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

A: Answer:-  The hearing aid increase the intensity of sound level 34.2 dB or has a gain 34.2 dB . The…

Q: A 57-dB sound wave strikes an eardrum whose area is 5.0x10-5m^2. The intensity of the reference…

A:

Q: Sound is detected when a sound wave causes the eardrum to vibrate. Typically, the diameter of the…

A: Given:The diameter of the ear is .The intensity of the sound is .

Q: You like to listen to music at a sound intensity of 3.3×10−53.3×10−5 W/m2. What is the intensity…

A: Given: The intensity of the sound is 3.3x10-5 W/m2. The intensity of sound for threshold hearing is…

Q: A sound wave is traveling in seawater, where the adiabatic bulk modulus and density are 2.31 × 10⁹…

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Q: The eardrum, which transmits sound vibrations to the sensory organs of the inner ear, lies at the…

A: Given: For adults, the ear canal length (L)= 2.6 cm =2.6 x 10-2m. The speed of sound in the air of…

Q: A sound source creates a sound intensity at a certain distance. If the sound intensity is increase…

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Q: Because the human ear is so sensitive to sounds, it can detect very small intensities.  The lower…

A: Given intensity I=2.443 μW/m2I=2.443×10-6 W/m2And standard intensity level, Io=10-12 W/m2 Intensity…

Q: f a sound that has a level 3.00 dB lower than a 3.33 ✕ 10−9 W/m2 sound? (b)

A: Givenβ=3 dB

Q: (a) What is the intensity (in W/m³) of a sound that has a level 3.00 d8 lower than a 4.03 x 10-"…

A: The total amount of sound energy flowing per unit time per unit area perpendicular to the direction…

Q: The relationship between the number of decibles B and the intensity I in watts per square meteris…

A: Let original intensity = I new intensity = 100 I B = 10 log ( I * 1012)B1 = 10 log ( I * 1012)B2 =…

Q: The lower intensity that a human can hear (which is represented with the symbol I0) is about 1x10-12…

A: The intensity of an sound is defined as a ratio of power and per unit area carried by wave. The…

Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.