Purchase Solution

Environmental Air Quality

Not what you're looking for?

Ask Custom Question

1. Describe differences between sound power, sound intensity, and sound pressure.

2. What range of frequencies can humans hear? What range of frequencies do humans hear best?

3. Identify the primary sources of environmental noise.

4. What reference pressure is used in determining sound pressure levels?

5. Describe the relationship between sound pressure and distance from a source. If the distance is doubled, what is the difference in sound pressure levels in decibels?

6. What are weighting scales? Why are they used?

7. Most environmental noise measurements are made using a Type II meter. What is a Type II meter?

8. If you are exposed to two sound sources of 83 dBA each, what is your actual exposure in decibels?

9. How is loudness related to sound energy?

Purchase this Solution

Solution Summary

This solution helps with the following problems regarding sound and hearing.

Solution Preview

Please see the attached pdf file for proper formatting.
1. Describe differences between sound power, sound intensity, and sound pressure.
Sound power is the sound energy emitted by a sound source per unit time.
Sound intensity is the average sound power transmitted across unit cross-sectional area of the medium.
Sound pressure is the variation in pressure with time along the direction of propagation of sound waves, due to oscillation of medium particles.
Sound pressure is a force quantity, while sound power and sound intensity are energy quantities.
Sound pressure and sound power vary with time, while sound intensity is an average value over time.

2. What range of frequencies can humans hear? What range of frequencies ...

Solution provided by:
  • BEng, Allahabad University, India
  • MSc , Pune University, India
  • PhD (IP), Pune University, India
Recent Feedback
  • " In question 2, you incorrectly add in the $3.00 dividend that was just paid to determine the value of the stock price using the dividend discount model. In question 4 response, it should have also been recognized that dividend discount models are not useful if any of the parameters used in the model are inaccurate. "
  • "feedback: fail to recognize the operating cash flow will not begin until the end of year 3."
  • "Answer was correct"
  • "Great thanks"
  • "Perfect solution..thank you"
Purchase this Solution

Free BrainMass Quizzes

This quiz provides a brief review to different energy examples. How is energy evident in our world? This vocabulary is important to understand the connection between energy and matter.

United States and Canada Vocabulary

Assessment of basic vocabulary terms related to geography and resources in the United States and Canda.

"Tornadoes and Hurricanes" Vocabulary

Brief introduction to vocabulary terms related to the atmosphere. Definitions are related to conditions for tornadoes and hurricanes.

Environmental Awareness 2020

This quiz is to test your knowledge and awareness on the current environmental issues that are posing a serious threat to the planet.

Structure of the Earth

Basic introduction to terms related to the structure of the Earth, including definitions and application of knowledge. This quiz focuses on the spheres.