A concert was held on an open field. You and your friends were there at the time and were 20 m away from the speaker. (a)How much intensity of sound would you here if the speaker has a 15,000 W of power and is used at its full capacity? (b)According to National Institute on Deafness and Other Communication Disorders, long or repeated exposure to sound at or above 85 decibels can cause hearing loss. With this information, at least how much more should you and you friend move from your current position to prevent any hearing damages?

A concert was held on an open field. You and your friends were there at the time and were 20 m away from the speaker. (a)How much intensity of sound would you here if the speaker has a 15,000 W of power and is used at its full capacity? (b)According to National Institute on Deafness and Other Communication Disorders, long or repeated exposure to sound at or above 85 decibels can cause hearing loss. With this information, at least how much more should you and you friend move from your current position to prevent any hearing damages?

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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and what techniques are used to observe them. 3. Assuming a sound speed of 1500 m/s; if we send a pulse towards nadir and receive an echo return after 0.5s, what is the depth of the seabed? If we send the same pulse through warmer water and still obtain a return after 0.5s, would you expect the depths to be the same? Explain.
Learning Goal: To learn the properties of logarithms and how to manipulate them when solving sound problems. The intensity of sound is the power of the sound waves divided by the area on which they are incident. Intensity is measured in watts per square meter, or W/m². The human ear can detect a remarkable range of sound intensities. The quietest sound that we can hear has an intensity of 10-¹2 W/m², and we begin to feel pain when the intensity reaches 1 W/m². Since the intensities that matter to people in everyday life cover a range of 12 orders of magnitude, intensities are usually converted to a logarithmic scale called the sound intensity level 3, which is measured in decibels (dB). For a given sound intensity I, B is found from the equation where Io B = (10 dB) log ( In = 1.0 × 10-¹² W/m². The logarithm of x, written log(x), tells you the power to which you would raise 10 to get x. So, if y = log(x), then x = 10%. It is easy to take the logarithm of a number such as 10², because…
Learning Goal: To learn the properties of logarithms and how to manipulate them when solving sound problems. The intensity of sound is the power of the sound waves divided by the area on which they are incident. Intensity is measured in watts per square meter, or W/m². The human ear can detect a remarkable range of sound intensities. The quietest sound that we can hear has an intensity of 10-12 W/m², and we begin to feel pain when the intensity reaches 1 W/m². Since the intensities that matter to people in everyday life cover a range of 12 orders of magnitude, intensities are usually converted to a logarithmic scale called the sound intensity level 3, which is measured in decibels (dB). For a given sound intensity I, B is found from the equation B = (10 dB) log Io where Io = 1.0 × 10-¹² W/m². The logarithm of x, written log(x), tells you the power to which you would raise 10 to get x. So, if y = log(x), then x = 10%. It is easy to take the logarithm of a number such as 10², because you…