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Introduction lesson animated

  1. 1. Sound<br />
  2. 2. Overview<br />The Facts of Sound<br />The Ear and Sound<br />Sound Vocabulary<br />Musical Instruments and Sound<br />
  3. 3. The Facts<br />Sound …<br />Is a form of energy produced & transmitted by vibrating matter<br />Travels in waves<br />Travels more quickly through solids than liquids or gases<br />A wave is a repeating disturbance or movement that transfers energy through matter or space<br />
  4. 4. The water waves below are carrying energy. Waves can only exist as they have energy to carry.<br />
  5. 5. The Ear<br /><ul><li>Sound is carried to our ears through vibrating air molecules.
  6. 6. Our ears take in sound waves & turn them into signals that go to our brains.</li></li></ul><li><ul><li>Sound waves move through 3 parts of the ear; outer ear, middle ear, & inner ear.
  7. 7. The sound waves cause pressure changes against our ear drum sending nerve impulses to our brain.
  8. 8. Sound waves move through 3 parts of the ear; outer ear, middle ear, & inner ear.
  9. 9. The sound waves cause pressure changes against our ear drum sending nerve impulses to our brain.</li></li></ul><li>Vibration<br /><ul><li>Back and forth movement of molecules of matter
  10. 10. For example,</li></li></ul><li>Compression<br /><ul><li>Where molecules are being pressed together as the sound waves move through matter
  11. 11. For example,
  12. 12. a wave travels through the springs just like sound waves travel through the air
  13. 13. the places where the springs are close together are like compressions in the air.</li></li></ul><li>Sound Waves<br /><ul><li>Alternating areas of high & low pressure in the air
  14. 14. ALL sound is carried through matter as sound waves
  15. 15. Sound waves move out in ALL directions from a vibrating object</li></li></ul><li>Wavelength & Frequency<br /><ul><li>Wavelength is the distance between one part of a waveand the same part of the next wave
  16. 16. Frequency is the number of waves moving past a point in one second</li></li></ul><li>Frequency is the number of waves (vibrations) that pass through a point in one second.<br />Period is the time it takes for one full wavelength to pass a certain point.<br />Frequency is waves per second.<br />Period is seconds per wave.<br />
  17. 17. Pitch<br />A measure of how high or low a sound is<br />Pitch depends on the frequency of a sound wave<br />For example,<br /><ul><li>Low pitch
  18. 18. Low frequency
  19. 19. Longer wavelength
  20. 20. High pitch
  21. 21. High frequency
  22. 22. Shorter wavelength</li></li></ul><li>Sonar<br /><ul><li>An instrument that uses reflected sound waves to find underwater objects
  23. 23. For example,</li></ul>Humans use sonar to locate or map objects<br />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<br />
  24. 24. Sound and Instruments<br /><ul><li>Instruments can be played at different pitches by changing lengths of different parts.
  25. 25. For example,
  26. 26. Another way to make different pitches is to change the thickness of the material that vibrates.
  27. 27. For example:</li></ul>A trombone’s mute absorbs some of the sound waves produced, thus producing a softer note when played.<br />
  28. 28. Now it is time to explore the sound properties!<br />
  29. 29. Works Consulted<br />“Pete's Power Point Station.” n.p., n.d. Web. 24 Jul. <br /> 2011. <><br />“Module 7” Greenville Public Schools. n.p., n.d. Web. 24 Jul. <br /> 2011. <br />