Sound<br />
What Is Sound?<br /><ul><li>Waves produced by the vibrations of material objects
Ex. guitarr, the strings vibrate
Air-molecules that pusheachotherinto a chainreaction
The waves are the vibrations, the waveshave tops and bottoms </li></li></ul><li>Different Sounds<br /><ul><li>Frequency: t...
You count the tops of the waves
High-pitched sound has a high frequency
Low-pitched sound has a lowfrequency</li></li></ul><li>High And LowFrequencies<br />
Different sounds<br /><ul><li>Unitcalled Hertz (Hz) to mesaurefrequency
If the frequency of a guitarr string is 1000 Hz, it means that the string vibrates 1000 times per second
The inventor of the frequencyunitwas the German physicist Heinrich Hertz
You canmesaurefrequency with an oscilloscope or a computer</li></li></ul><li>Oscilloscope<br />Heinrich Hertz<br />
What Can WeHear?<br /><ul><li>The human earcanhearbetween 20 Hz and 20 000 Hz
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Presentation1

  1. 1. Sound<br />
  2. 2. What Is Sound?<br /><ul><li>Waves produced by the vibrations of material objects
  3. 3. Ex. guitarr, the strings vibrate
  4. 4. Air-molecules that pusheachotherinto a chainreaction
  5. 5. The waves are the vibrations, the waveshave tops and bottoms </li></li></ul><li>Different Sounds<br /><ul><li>Frequency: the amount of vibration per unit time, for instance second, defineshow high the tone is
  6. 6. You count the tops of the waves
  7. 7. High-pitched sound has a high frequency
  8. 8. Low-pitched sound has a lowfrequency</li></li></ul><li>High And LowFrequencies<br />
  9. 9. Different sounds<br /><ul><li>Unitcalled Hertz (Hz) to mesaurefrequency
  10. 10. If the frequency of a guitarr string is 1000 Hz, it means that the string vibrates 1000 times per second
  11. 11. The inventor of the frequencyunitwas the German physicist Heinrich Hertz
  12. 12. You canmesaurefrequency with an oscilloscope or a computer</li></li></ul><li>Oscilloscope<br />Heinrich Hertz<br />
  13. 13. What Can WeHear?<br /><ul><li>The human earcanhearbetween 20 Hz and 20 000 Hz
  14. 14. As wegrowolder the limits of the human hearing rangedecrease
  15. 15. Sound waves with frequenciesbelow 20 Hz are calledinfrasonic sound
  16. 16. Sound waves with frequenciesabove 20 000 Hz are calledultrasonic sound
  17. 17. Wecan’thearinfrasonic and ultrasonic sounds</li></li></ul><li>Hertz<br />
  18. 18. Volume of Sound<br /><ul><li>You canmesaure the volume of sound with the unitcalled Decibel (dB)
  19. 19. There is a scale to seehow strong different sounds are
  20. 20. The scale is made so when the sound increases with 10 dB it’s 10 timesstronger</li></li></ul><li>Volume of Sound<br /><ul><li>90 dB  10 timesstrongerthan 80 dB, and 100 timesstrongerthan 70 dB
  21. 21. Butweperceiveloudnessdifferently, when the volumeincreases with 10 dB, wepercieve it as twice as strong instead of ten timesstronger</li></li></ul><li>Decibel Scale<br />
  22. 22. Sound With Different EmphasisHave Different Frequencies<br />
  23. 23. The End<br />

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