**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

Answered: Image /qna-images/answer/afb494e5-96b3-4b60-bfc6-acadf36c2814.jpg

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)...

See similar textbooks

Similar questions

Calculate the intensity of radiation for the surface which has temperature of 200 °C. Select one: a. 792.8 W/m^2 b. 903.8 W/m^2 c. 861.7 W/m^2 d. 1000 W/m^2
75cm The intensity of sunlight sdeiking the earth is 1.4kW/m². what is the maximum power that could possibly be abrorbed by the earcth? (The earth's radius is 4000 miles) How does this Compare with the average power dlemands af humankind! Given the earth-sun distarice of 93 million miles, of I50 million miles, and the mars -Sun distance what is the intenrity of sunlight shriking mars? The 6 pluto-sun dirtance is about 4. billion miles; what is intinidy on pluta?
consider a bright star in our sky. assume its distance from earth is 38.3 light-year (ly) and its power output is 4.00 * 10^28 W. about 100 times that of the sun. one light-year is the distance traveled by light through a vacuum in one year. a. find the intensity of the starlight at the earth. b. find the power of the starlight at the earth intercepts ( the radius of earth is 6.38 * 10^6 m .)
QUESTION 5 The distance between Planet X and a star is 1.2 x 1011 m. At the surface of Planet X, the average intensity of the radiation from the star is 5355 W/m2. If the star radiates isotropically, which of the following is the average power of the star? 5.47 x 1027 w
An earth-orbiting satellite has solar energy–collecting panels with a total area of 4.0 m2 . If the sun’s radiation is perpendicular to the panels and is completely absorbed, find the average solar power absorbed and the average radiation-pressure force
A hanging lamp with a 70-W omni-directional bulb has a hemi-spherical lamp shade of height, H = 0.55 m, as shown below. (a) Find the total (average) power received across the shade. W (b) Calculate the intensity at a point on the shade. W/m²
An earth-orbiting satellite has solar energy–collecting panels with a total area of 4.0 m2 . If the sun’s radiation is perpendicular to the panels and is completely absorbed, find the average solar power absorbed and the average radiation-pressure force
4. As noted in the preceding example, the Sun delivers about 1 000 W/m² of energy to the Earth's surface via electromagnetic radiation. (a) Calculate the total power that is incident on a roof of dimensions 8.00 m ×20.0 m. (b) Determine the radiation pressure and the radiation force exerted on the roof, assuming that the roof covering is a perfect absorber.
Because the speed of light in vacuum (or air) has such a large value, it is very difficult to measure directly. To measure this speed, you conduct an experiment in which you measure the amplitude of the electric field in a laser beam as you change the intensity of the beam. Figure is a graph of the intensity I that you measured versus the square of the amplitude Emax of the electric field. The bestfit straight line for your data has a slope of 1.33 x 10-3 J/(V2 . s). (a) Explain why the data points plotted this way lie close to a straight line. (b) Use this graph to calculate the speed of light in air.
Seawater has the following electrical characteristics: conductivity o=4 S/m, dielectric constant e=80, and permeability u=1. Calculate the attenuation length for a plane wave propagating in seawater at frequencies f=1 kHz, 1 MHz, and 10 GHz. From your calculation, which of these frequencies can possibly be used to communicate with a submarine?
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