Lab _2 - Sound Revised 2-9-2011

Lab _2 - Sound Revised 2-9-2011 - Revised February 2011...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Revised February 2011 Page 1 of 6 2/9/2011 EXERCISE #2 MONITORING NOISE LEVELS The most common sources of excessive noise include the construction industry, transportation, airport runways, and urban areas, among others. Excessive noise is an environmental pollutant. It may seem strange to categorize noise as pollution like we would with smog or chemical spills, but if we consider polluted air or impure water as pollution because it harms our health, then loud noise that is damaging to our hearing would fall into the same category! Certain extremely loud noises are obviously bad for our ears and the instinctive response is to cover them. However, some noises are not painfully loud, and although we may consider them harmless, over time these can lead to permanent damage. According to the U.S. Environmental Protection Agency (EPA) in their "Information on Levels of Environmental Noise Requisite to Protect Public Health and Welfare with an Adequate Margin of Safety," a 24-hour exposure level of 70 decibels is the maximum level of environmental noise that will prevent any measurable hearing loss over a lifetime. EPA also identifies maximum noise levels of 55 decibels outdoors and 45 decibels indoors as necessary to prevent activity interference and annoyance. The physical energy released on the hair cells in the ear by continuous day after day exposure to noise leads to irreversible damage to these hair cells, causing hearing loss. Thus, it is important to recognize in our environment, this noise pollution that can cause long-term damage to our health. Hearing is the interpretation by your brain of the intensity of sound waves. The sensation of loudness is related to the intensity of the sound waves and is measured in units of decibels (dB).
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern