A portable audio speaker has a power output of 8.00 W. (a) If the speaker emits sound equally in all directions, what is the sound intensity at a distance of 2.00 m from the speaker? (b) At what distance from the speaker is the intensity equal to 0.045 W/m2?
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A portable audio speaker has a power output of 8.00 W.
(a) If the speaker emits sound equally in all directions, what is the sound
intensity at a distance of 2.00 m from the speaker? (b) At what distance
from the speaker is the intensity equal to 0.045 W/m2?
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- The human audible range is from 20 Hz to 20kHz sound of intensity 120 dB; beyond which is already painful and may cause harm and damage to the hearing organs. How many times more intense is this sound from the threshold? * O 12 X 10*10 O 1X 10*12 120Sound is detected when a sound wave causes the eardrum to vibrate. Typically, the diameter of the eardrum is about 8.0mm in humans. When someone yells to you in a noisy environment, the sound intensity at your ear sometimes approximates 2 x 10-6 W/m2. Suppose that the 2 x 10-6 W/m2 of sound you are hearing comes from a janitor cleaning a rug by pulling a vacuum cleaner (at the end of a 1-meter-long tube oriented perpendicularly to the line separating you from the janitor). This person is yelling just over the din of the appliance in order to be heard by you. Estimate the distance between you and the janitorTwo students hear the same sound and their eardrums receive the same power from the sound wave. The sound intensity at the eardrums of the first student is 0.79 W/m^2, while at the eardrums of the second student the sound intensity is 1.18 times greater. (A)What is the ratio of the diameter of the first student's eardrum to that of the second student? (B)If the diameter of the second student's eardrum 0.99 cm, how much acoustic power, in microwatts, is striking each of his (and the other student's) eardrums?
- As a jet plane takes off, at 5.0 m the sound wave intensity is 100 W/m². An observer stands 120 m from the runway. What is the intensity of the sound wave that reaches the observer's ear?A sound source creates a sound intensity at a certain distance. If the sound intensity is increased by a factor of 8.1, by how many decibels is the sound intensity level increased?A typical adult ear has a surface area of 1.41 × 10-3 m2. The sound intensity during a normal conversation is about 3.02 × 10-6 W/m2 at the listener's ear. Assume that the sound strikes the surface of the ear perpendicularly. How much power is intercepted by the ear?
- What is the intensity (in W/m2) of a sound that has a level 3.00 dB lower than a 3.33 ✕ 10−9 W/m2 sound? (b) What is the intensity (in W/m2) of a sound that is 10.0 dB higher than a 3.33 ✕ 10−9 W/m2 sound?Please have answers computer typed.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.
- Diagnostic ultrasound of frequency 3.43 MHz is used to examine tumors in soft tissue. (a) What is the wavelength in air of such a sound wave? (b) If the speed of sound in tissue is 1310 m/s, what is the wavelength of this wave in tissue? (Take the speed of sound in air to be 343 m/s.) (a) Number i Units (b) Number UnitsThe warning tag on a lawn mower states that it produces noise at a level of 99.0 dB. What is this in W/m2?Two students are standing the same distance from a source of sound. The first student receives a power of 36 × 10-6 W in their eardrum. The second student receives σ = 1.13 times more power in their eardrum. Part (a) What is the ratio of the diameters of the student's eardrums? Part (b) If the second student's eardrum has a diameter of d = 1 cm what was the intensity of the sound that the student heard, in watts per square meter?