*72. Go Review Conceptual Example 8 as background for this problem.A loudspeaker is generating sound in a room. At a certain point, thesound waves coming directly from the speaker (without reflecting fromthe walls) create an intensity level of 75.0 dB. The waves reflected fromthe walls create, by themselves, an intensity level of 72.0 dB at thesame point. What is the total intensity level? (Hint: The answer is not147.0 dB.)

The sound intensity level without reflection is,…

Answered: *72. Go Review Conceptual Example 8 as…

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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You are trying to overhear a most interesting conversation, but from your distance of 10.0 m , it sounds like only an average whisper of 20.0 dB . So you decide to move closer to give the conversation a sound level of 60.0 dB instead. How close should you come? Formula: I = I0⋅10(β/10) a) What intensity I1 corresponds to 20.0 dB ? b) What intensity I2 corresponds to 60.0 dB ?
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?
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A sound wave travels from air (Z 413 kg m2 s1) to a liquid with a density of (950 kg m3) and a speed of sound in it (1-cm s 75000). 1) What percentage of the wave is reflected at the boundary? 2) What percentage of the wave travels across the boundary?
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What 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 m
Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of about 55 kHz to navigate and find prey. Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 90 m below. How much time elapses before the dolphin hears the echoes of the clicks? (The speed of sound in seawater is approximately 1530 m/s.) What is the wavelength of 55 kHz sound in the ocean?
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6. You measure the intensity level of a sound wave 6 cm from its source (treat as a point source), and the result is 84 dB. What is the intensity of this sound wave? Answer:
You hear a song from your playlist you haven't heard in a while and it warrants you to commence singing. As you are sing, the power of the compression wave you create is approximately 579.05 nW (note, nW is nano-Watts). What is the intensity of this sound as measured by your roommate who is standing 9.89m from you? Please give your answer in units of nW/m2. This unit is not a common one. Usually, the unit would simply be Watts per square-meter (which would be your answer divided by a million!). This goes to show you that are ears are amazingly sensitive to very tiny sound intensities. Note: Intensity was a topic covered in section 11.1, and I will provide the formula: ?=?/?I=P/A where ?P is the power in units of Watts, and ?A is the surface area of a sphere of radius "L" (in this problem).

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