**Homework #3****Student Name:** ______________________________________ **Date:** ________________---**Problem #12:** The intensity of sound wave A is 100 times that of sound wave B. Relative to wave B the sound level of wave A is:a. -2 dB b. +2 dB c. +10 dB d. +20 dB e. +100 dB ---**Problem #13:** A source of sound emits 5.0 mW of acoustic power uniformly in all directions. (a) Calculate the intensity of this sound wave 10.0 m from the source. (b) Find the sound level in decibels 10.0 m from the source. ---**Problem #14:** The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is \(6.0 \times 10^{-10} \, W/m^2\). What is the power emitted by the source? ---**Problem #15:** With one violin playing, the sound level at a certain place is measured as 50 dB. If four violins play equally loudly, what will the sound level most likely be at this place?---**Problem #16:** A source is emitting sound uniformly in all directions. There are no reflections anywhere. A flat surface faces the source. Is the sound intensity the same at all points on the surface? Give your reasoning.---**Problem #17:** If two people talk simultaneously and each generates an intensity level of 65 dB at a certain point, does the total intensity level at this point equal 130 dB? Account for your answer. ---**Problem #18:** A typical adult ear has a surface area of \(2.1 \times 10^{-3} \, m^2\). The sound intensity during a normal conversation is about \(3.2 \times 10^{-6} \, W/m^2\) at the listener’s ear. Assume that the sound strikes the surface of the ear perpendicularly. How much power is intercepted by the ear?---**Problem #19:** You and a friend are watching fireworks that are launching from Grant Park. You are standing right in front of 624 S. Michigan Building (150 m from the launch area) and your friend is across campus at the Film Department (700 m from the launch area). The sound **Homework #3****Intensity of the sound**Here is a link for a video that can help you to solve this homework:[https://www.youtube.com/watch?v=twppIJ9Eizp8](https://www.youtube.com/watch?v=twppIJ9Eizp8)**Problem #1:** What is the intensity in watts per meter squared of 85.0-dB sound?**Problem #2:** The warning tag on a lawn mower states that it produces noise at a level of 91.0 dB. What is this in watts per meter squared?**Problem #3:** What intensity level dB corresponds to a sound of \(3.04 \times 10^{-4}\) W/m²?**Problem #4:** What sound intensity level in dB is produced by earphones that create an intensity of \(4.00 \times 10^{-2}\) W/m²?**Problem #5:** What is the intensity of a sound that has a level 7.00 dB lower than a \(4.00 \times 10^{-9}\) W/m² sound?**Problem #6:** What is the intensity of a sound that is 3.00 dB higher than a \(4.00 \times 10^{-9}\) W/m² sound?**Problem #7:** If a large housefly 3.0 m away from you makes a noise of 40.0 dB, what is the noise level of 1000 flies at that distance, assuming interference has a negligible effect?**Problem #8:** The noise from a grinder in a factory is 32,000 times more powerful than the noise from a dishwasher. By how many decibels is the factory noise greater than the dishwasher noise?**Problem #9:** A loud sound is 90 dB. When the sound is reduced to 5% of its original intensity, what is the decibel level?**Problem #10:** At a rock concert, a dB meter registered 130 dB when placed 2.8m in front of a loudspeaker on the stage. What is the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in air?**Problem #11:** By how many decibels do you reduce the sound intensity level due to a source of sound if you quadruple your distance from it? Assume that the waves expand s

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Answered: Problem #14: The intensity at a…

Problem #14: The intensity at a distance of 6.0m from a source that is radiating equally in all directions is 6.0x10^-10 W/m^2. What is the power emitted by the source?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Current Attempt in Progress The power radiated by the sun is 3.9 × 10²6 W. The earth orbits the sun in a nearly circular orbit of radius 1.5 × 10¹¹ m. The earth's axis of rotation is tilted by 23.4° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator perpendicularly. What power strikes a 0.29-m² patch of flat land at the equator at point Q? Number Sunlight Axis of rotation Save for Later Equator 0 eTextbook and Media 23.40 Units î Attempts: 0 of 5 used Submit Answor