Sound Notes - WordPress.com

Sound Notes - WordPress.com

Sound Notes Chatfield Senior High Department of Physics Sound is a Wave

It is a longitudinal (1-D) wave Properties of Sound Transmission-sound goes through a

material Reflection- waves bounce off at the same angle it was received Absorption- waves are blocked by a substance (opposite of transmission)

Transmission in space? Sound requires a medium to travel Speed of Sound

It is variable based upon temperature and density of the material Approximate values of speed of sound Air

(00-) 330 m/s Air (25o) 343 m/s Water-1440 m/s Glass-4550 m/s Iron and Steel- 5000m/s

Lab 1- Verifying frequency of a tuning fork Determine period of wave by averaging 10 wavefronts as below and then use f=1/T to verify frequency

FFT Curve Lab 2-Sound through echo Find distance of the tube and double it (why?) Use v=d/t to determine the speed of sound in

air. Lab 3-Finding Resonance of Tube Find frequency where sound rings out

The sound is reflecting off the water and therefore creates a closed ended tube The is basically a quarter of a wavelength (why?)

Resonance in Sound Wavelengths that have the same amplitude and frequency that result in an increase of amplitude

Closed Ended Tube (Pipe organ) Open-Ended Tubes and Strings (Organ / Guitar String) (1/2

The decibel A logarithmic scale that shows the loudness of sound L=10 A A= log L Table of values

Threshold of hearing- 0 dB Whisper-20 dB Library-40 dB Refrigerator-45 dB Restaurant- 50 dB Ordinary Conversation-65 dB

Busy Traffic- 70 dB Screaming Child- 90 dB iPod at Maximum Volume-108 dB CSH Fire Alarm-115 dB Threshold of Pain-120 dB Jet Airplane-140 dB

Frequencies of Sound The human ear hears sound from the range from 20-20000 Hz We hear sounds the best from 1000-

5000 Hz Frequencies of Music Range of Audibility of the

Human Ear Ultrasound (Frequencies above human hearing) Beats

Two waves constructively interfering whose frequencies are above or below each other The Ear

Function of the Ears parts Outer ear-pinna-collects sound Middle ear-transmits vibrations to the inner ear Inner ear-fluid transmitted to hair cells

that have nerve endings (also used for balance) Doppler Effect When an object is moving toward the observer

the pitch is higher When an object is moving away from the observer the pitch is lower Sonic Boom

Sound and Music Most purethe Blue Man Group

Recently Viewed Presentations

  • Mesopotamia Cradle of Civilization Mesopotamia Geographic areaIn modern

    Mesopotamia Cradle of Civilization Mesopotamia Geographic areaIn modern

    Family Life Woman had rights in Sumerian society They could buy and sell property and could run businesses The husband was the head of the household He could divorce his wife or rent out his wife and children for up...
  • Pollution in Asia - TypePad

    Pollution in Asia - TypePad

    Describe the causes and effects of air pollution and flooding in India and China. Describe the causes and effects of pollution on the Yangtze and Ganges Rivers. Pollution in Asia. Air Pollution. Asian Brown Cloud. 2 mile deep brown haze....
  • Overview - wet.kuleuven.be

    Overview - wet.kuleuven.be

    Examiners should announce the feedback moments for their exam before each examination period on Toledo Students may be accompanied by anyone of their choice to the extent that the latter is not a student who him/herself has to sit examinations...
  • Computer Vision Marc Pollefeys COMP 256 Administrivia  Classes:

    Computer Vision Marc Pollefeys COMP 256 Administrivia Classes:

    To introduce the main concepts and techniques used to solve those. To enable participants to implement solutions for reasonably complex problems. ... Slide 20 Slide 21 Structure from motion IBM's pieta project Photometric stereo + structured light Segmentation Slide 25...
  • Frequency Domain Representation of Biomedical Signals

    Frequency Domain Representation of Biomedical Signals

    Frequency Domain Representation of Biomedical Signals Fourier's findings provide a general theory for approximating complex waveforms with simpler functions that has numerous applications in mathematics, physics, and engineering.
  • Targeting, Screening and Assessment

    Targeting, Screening and Assessment

    The SSVF Program was established by Section 604 of the Veterans' Mental Health and Other Care Improvements Act of 2008 (38 U.S.C. 2044) ... Providers are encouraged to allocate at least 5% of their grant award for legal services.
  • Windows Developer Day

    Windows Developer Day

    delivered as APIs for Windows, Android, iOS, and Microsoft Graph, enabling client and cloud apps to build experiences using the Project Rome capabilities. Our mission is simple, drive app engagement across devices and platforms. We do this by offering APIs...
  • How do Geopolitics and Critical Geopolitics Help us ...

    How do Geopolitics and Critical Geopolitics Help us ...

    Nicholas Spykman's Rimland Theory: Spykman thought that the Rimland, the strip of coastal land that encircles Eurasia, is more important than the central Asian zone (the so-called Heartland) for the control of the Eurasian continent.