College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- 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…arrow_forwardTwo strings both vibrate at exactly 764 Hz. The tension in one of them is then increased slightly. As a result, 6 beats per second are heard when both strings vibrate. What is the new frequency of the string that was tightened? Calculate to one decimal.arrow_forwardConvert the following frequencies into wavelengths, expressing the result in the indicated unit. a. 3.19 MHz (mm) b. 89.1 kHz (m) c. 43.3 Hz (km) d. 4.73 GHz (μm)arrow_forward
- y [m] 1.5 1.0 0.5 0.0 A 0.0 y = μx+b 0.5 y = √2-x² 1.0 B Timer Notes Evaluate x [m] = 0.75 at x = 1. See the Figure. Note that on the red line, y = 0.5 at x = 0, and y What is the distance from A to B? Express the answer in 3 significant figures. 1.207 m 1.21 m O 1.210 m 1.22 m 1,20 marrow_forwardP=P0COS(150t-2x) t is seconds, x is meters ID wave number and angular frequencyarrow_forwardCould you please explain how to do this? I really dont understand it and could use a clear explanation.arrow_forward
- A traveling wave is described by the equaion that follows. D(x,t) = 54.2sin(0.75x-65t), where x is in meters and t is in seconds. What is the wavelength (in meters) of this wave? Add your answer Dearrow_forwardA 4.4 Hz continuous wave travels on a Slinky. If the wavelength is 0.57 m, what is the speed of waves on the Slinky (in m/s)?arrow_forward
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