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Introduction lesson animated Introduction lesson animated Presentation Transcript

  • Sound
  • Overview
    The Facts of Sound
    The Ear and Sound
    Sound Vocabulary
    Musical Instruments and Sound
  • The Facts
    Sound …
    Is a form of energy produced & transmitted by vibrating matter
    Travels in waves
    Travels more quickly through solids than liquids or gases
    A wave is a repeating disturbance or movement that transfers energy through matter or space
  • The water waves below are carrying energy. Waves can only exist as they have energy to carry.
  • The Ear
    • Sound is carried to our ears through vibrating air molecules.
    • Our ears take in sound waves & turn them into signals that go to our brains.
    • Sound waves move through 3 parts of the ear; outer ear, middle ear, & inner ear.
    • The sound waves cause pressure changes against our ear drum sending nerve impulses to our brain.
    • Sound waves move through 3 parts of the ear; outer ear, middle ear, & inner ear.
    • The sound waves cause pressure changes against our ear drum sending nerve impulses to our brain.
  • Vibration
    • Back and forth movement of molecules of matter
    • For example,
  • Compression
    • Where molecules are being pressed together as the sound waves move through matter
    • For example,
    • a wave travels through the springs just like sound waves travel through the air
    • the places where the springs are close together are like compressions in the air.
  • Sound Waves
    • Alternating areas of high & low pressure in the air
    • ALL sound is carried through matter as sound waves
    • Sound waves move out in ALL directions from a vibrating object
  • Wavelength & Frequency
    • Wavelength is the distance between one part of a waveand the same part of the next wave
    • Frequency is the number of waves moving past a point in one second
  • Frequency is the number of waves (vibrations) that pass through a point in one second.
    Period is the time it takes for one full wavelength to pass a certain point.
    Frequency is waves per second.
    Period is seconds per wave.
  • Pitch
    A measure of how high or low a sound is
    Pitch depends on the frequency of a sound wave
    For example,
    • Low pitch
    • Low frequency
    • Longer wavelength
    • High pitch
    • High frequency
    • Shorter wavelength
  • Sonar
    • An instrument that uses reflected sound waves to find underwater objects
    • For example,
    Humans use sonar to locate or map objects
    Animals use sonar or echo location to find their prey; these sounds have such a high pitch or frequency that the human ear cannot hear
  • Sound and Instruments
    • Instruments can be played at different pitches by changing lengths of different parts.
    • For example,
    • Another way to make different pitches is to change the thickness of the material that vibrates.
    • For example:
    A trombone’s mute absorbs some of the sound waves produced, thus producing a softer note when played.
  • Now it is time to explore the sound properties!
  • Works Consulted
    “Pete's Power Point Station.” ppst.com. n.p., n.d. Web. 24 Jul.
    2011. <http://science.pppst.com/sound.html>
    “Module 7” Greenville Public Schools. n.p., n.d. Web. 24 Jul.
    2011.