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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:A LaGuardia Physics Professor is in the front row at a concert of Grateful Dead rock band, he is 4.2 meters
away from the speaker. If the professor hears the sound at a level of B₁ = 131 dB, what is the intensity of
the sound at this distance?
The intensity of the sound, 1₁
=
1.2589254✓✔ Units W/m^2
What will be the intensity of the sound if the professor walks 33.7 m away from the speaker? What will be
the intensity level at this distance?
=
The intensity of the sound, 12
0.1953387✔ Units W/m^2
The corresponding intensity level, B₂:
=
112.907
Units dB
How far from the speaker should the professor go to reduce the should level to 75 dB?
The distance, d = 3.1622776 x Units km
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- A student hears a sound with a power of P = 42 μW. At their distance from the source, the sound has intensity I = 0.71 W/m2. A. Assuming the eardrum is circular, what is the radius of their eardrum, in meters? B. Another student stands in the exact same location, but receives 20% more power from the same source. What is the radius of the second student's eardrums?arrow_forward7.1 The plot shows vertical displacement on a string as a function of time, measured at a fixed point along the string. What is the frequency? (a) (b) (c) (d) (e) 0.5 Hz 1 Hz 2 Hz •AMMA 2 X = 29 4 = 21 f 4F = 2π t(s) 4 Hz There is insufficient information to answer this question.arrow_forwardAn intensity detector can be moved along a straight track. a source of spherical waves is placed at one end of the track. When the detector is 2 m away from the source, it measures an intensity of 80 W/m2. What distance do we need to move the detector from that position to get a measurement 13 dB lower? Answer: 6.95marrow_forward
- Two students are standing the same distance from a source of sound. The first student receives a power of 68 × 10-6 W in their eardrum. The second student receives σ = 1.2 times more power in their eardrum. What is the ratio of the diameters of the students eardrums? d1/d2= If the second students eardrums have a diameter of d=1cm what was the intensity of the sound that the student heard in watts per square meter? I=arrow_forwardWhat is the wavelength of a 256-hertz sound wave in air at 31 degrees Celsius? a b с Od 0.773 m 8.53 * 10^-7 m 1.17*10^6 m 1.37 marrow_forwardTwo progressive waves y (x, t) = A sin( 4 x – ot) and y2(x, t) = A sin(4x - - - ) travel in the same direction. Calculate the speed of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 = 4 m and w = 31.4 Hz. Provide your answer in Sl units.arrow_forward
- Problem #3: What intensity level dB in does a sound of 3. 04 × 10–4 W/m2 correspond to?arrow_forwardIn an experiment, students were testing their hearing range and found that it averaged about24.5 Hz to 1.82 x 104 Hz. What are the wavelengths of sound waves producing these frequencies in air where the speed of sound is 343 m/s?arrow_forward
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