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Why the noisepollution is considered a serious occupational health hazard.How can we prevent and control noise pollution in the workplace

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 145CP: A pulse moving along the x axis can be modeled as the wave function y(x,t)=4.00me( x+( 2.00m/s )t...

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(a) If a submarine’s sonar can measure echo times with a precision of 0.0100 s, what is the smallest difference in distances it can detect? (Assume that the submarine is in the ocean, not in fresh water.) (b) Discuss the limits this time resolution imposes on the ability of the sonar system to detect the size and shape of the object creating the echo.
A pulse moving along the x axis can be modeled as the wave function y(x,t)=4.00me( x+( 2.00m/s )t 1.00m)2 . (a)What are the direction and propagation speed of the pulse? (b) How far has the wave moved in 3.00 s? (c) Plot the pulse using a spreadsheet at time t=0.00 s and t=3.00 s to verify your answer in part (b).
Q#3: Why the noise pollution is considered a serious occupational health hazard? How can we prevent and control noise pollution in the workplace? What are the measurement units of noise? How can we measure the sound pressure level of the noise generated by a machine
Item 9 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 ß = (10 dB) log (1). where Io = 1.0 × 10-¹2 W/m². Part A What is the value of log(1,000,000)? Express your answer as an integer. ► View Available Hint(s) The logarithm of x, written log(x), tells you the power to which you would raise 10…
Item 9 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 matter 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 ß = (10 dB) log (1), 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 æ. So, if y = log(x), then x = 10³. It is easy to take the logarithm of a number such as 10², because…
Item 9 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 (1) where Io = 1.0 × 10-12 W/m². Part A What is the value of log (1,000,000)? Express your answer as an integer. ► View Available Hint(s) The logarithm of x, written log(x), tells you the power to which you would raise…
Q3/ Consider a radar system with Pr = 1,000,000 W What is the Noise figure of the system & SNR of the return from a 1-m” target at 20 km?
Sound An explosion occurs at a distance of 6.00 km from a person. How long after th explosion, does the person hear it? Assume the temperature is 14.0 °C. 17.671 s 16.771 s 11.671 s 17.071 s a. b. Compute the speed of sound in a monatomic ideal gas at 27.0 °C. Use M = 20.18 kg/kmol. a. C. 443.485 m/s 434.565 m/s 414.135 m/s b. d. 454.435 m/s A sound has an intensity of 3.00 x 108 W/m². What is the sound level in dB? a. C. 34.1712 dB 44.7712 dB 54.6132 dB 54.6321 dB b. d. A tuning fork oscillates at 284 Hz in air. Compute the wavelength of the tone emitted at 25 °C. 3.2912 m 1.1912 m An organ pipe whose length is held constant resonates at a frequency of 224.0 Hz when the air temperature is 15 °C. What will be its resonant frequency when the air temperature is 24 °C? 227.615 Hz 277.115 Hz a. b. a. b. C. d. 10.1361 μm 10.6431 μm C. d. a. 127.634 Hz 237.609 Hz b. An uncomfortably loud sound might have an intensity of 0.54 W/m². Find the maximum displacement of the molecules of air in a…
Consider a solid with linear lattice in which the interatomic distance is equal to 4.0A°. Calculate the velocity of sound in the solid by considering the cutoff frequency equal to 3.0 THz. Answer Choices: a. 2400 m/s b. 3600 m/s c. 1200 m/s d. 4800 m/s
The Weber-Fechner law describes how human beings perceive differences. Suppose, for example, that a person first hears a tone with a frequency of 400 hertz (cycles per second). He is then tested with higher tones until he can hear the difference. The ratio between these values describes how well this person can hear differences. a. Suppose the next tone he can distinguish has a frequency of 404 hertz. What is the ratio? b. According to the Weber-Fechner law, the next higher tone will be greater than 404 by the same ratio. Find this tone. c. Write the discrete-time dynamical system for this person. d. Suppose the experiment is repeated on a musician, and she manages to distinguish 400.5 hertz from 400 hertz. What is the fifth tone she can distinguish?
The flute is typically about 26 inches long and as we have seen this week it is an open tube at both ends. There are holes that are closed or opened by fingering and valves that change their effective length, and the pattern and mechanisms to do this set various designs of flutes played now and in the past. Assume that the velocity of sound in warm moist air is 340 m/s. 1. Take a bottle with a narrow opening that had your favorite beverage in it, and when it is empty blow across the top of the bottle. Now add some water so that the bottom of the bottle is covered and the air space is less with the bottle still vertical. Blow on that across the top. Does the pitch (frequency) of the resonant sound increase or decrease? You can try it yourself, and then explain what you found.
The speed of sound in a gas at T= 100°C is equal to 386.9 m/s. If the temperature of the gas is doubled, then the speed of the sound will be approximately equal to: Select one: O a. 773.8 m/s O b. 547.16 m/s O. 386.9 m/s