Buy Chemical Hazards Assignment

Buy Chemical Hazards Assignment
1. Describe how sound waves are produced, how they propagate, how fast they travel through air, and how they change with distance.
2. Dene frequency, period, amplitude, starting phase, and wave- length; interpret time-domain waveforms of pure tones with different frequencies, amplitudes, and starting phases.
3. Dene how intensity and pressure are related to each other; specify the minimum reference levels for intensity and pres- sure; specify the range of audibility for intensity (in watts/m2) and pressure (in µPa).
4. Understand why and how to use decibels to quantify intensity and pressure; describe the range of audibility of intensity and pressure using decibels; dene dB IL and dB SPL; describe the threshold of audibility across frequency.
5. Perform simple decibel calculations to compare the intensity and/or pressure of two sounds.
6. Explain the inverse square law and calculate how intensity or pressure changes with changes in distance.
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7. Understand how to combine the outputs of two sounds and the resulting dB IL and dB SPL.
8. Describe periodic and aperiodic complex vibrations; interpret time-domain and spectral graphs of complex vibrations; describe the importance of Fourier analyses.
9. Describe the basic acoustic characteristics of speech and un- derstand how to read spectrograms.
10. Understand how ltering can be used to shape the spectrum of noise; recognize commonly used lter shapes.
11. Explain what is meant by resonance; calculate resonance frequencies for simple tubes of varying length (open at both ends or only at one end); know the difference between a half- wave resonator and quarter-wave resonator.
Properties of Sound3
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C o p y r i g h t 2 0 1 9 . P l u r a l P u b l i s h i n g , I n c .
A l l r i g h t s r e s e r v e d . M a y n o t b e r e p r o d u c e d i n a n y f o r m w i t h o u t p e r m i s s i o n f r o m t h e p u b l i s h e r , e x c e p t f a i r u s e s p e r m i t t e d u n d e r U . S . o r a p p l i c a b l e c o p y r i g h t l a w .
EBSCO Publishing : eBook Collection (EBSCOhost) – printed on 2/11/2021 1:48 PM via COLUMBIA SOUTHERN EDUCATION GROUP AN: 1885529 ; Kramer, Steven J., Brown, David K., Jerger, James, Mueller, H. Gustav.; Audiology : Science to Practice Account: s3921192.main.eds
We live in a world of sounds, some of which are meaningful and some of which are just part of our noisy environment. We often take for granted the remarkable ability of the auditory system to extract meaningful sounds from the less mean- ingful so that we can sense danger, localize the source of a sound, communicate, learn, and even be entertained. Even when asleep we learn to tune out familiar sounds, but may wake up at an unfamiliar sound. At a noisy party, you can focus on a conversation with one person while ignor- ing the background conversations, but readily become aware when someone calls your name from across the room or your favorite song be- gins. When you listen to an orchestra or band you may find yourself listening to the whole song or picking out the various instruments. Our ability to hear in our everyday world requires the auditory system to process complex sounds from our envi- ronment. The process of hearing involves the gen- eration of sounds, their travels and interactions within the environment, physiological processing by the ear, neural processing in the nervous sys- tem, and psychological/cognitive processing by the brain. The sounds we hear have basic physi- cal properties that are processed by the auditory system into meaningful information.

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