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Presentation1 Presentation1 Presentation Transcript

  • Sound
  • What Is Sound?
    • 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
  • Different Sounds
    • Frequency: the amount of vibration per unit time, for instance second, defineshow high the tone is
    • You count the tops of the waves
    • High-pitched sound has a high frequency
    • Low-pitched sound has a lowfrequency
  • High And LowFrequencies
  • Different sounds
    • 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
  • Oscilloscope
    Heinrich Hertz
  • What Can WeHear?
    • The human earcanhearbetween 20 Hz and 20 000 Hz
    • As wegrowolder the limits of the human hearing rangedecrease
    • Sound waves with frequenciesbelow 20 Hz are calledinfrasonic sound
    • Sound waves with frequenciesabove 20 000 Hz are calledultrasonic sound
    • Wecan’thearinfrasonic and ultrasonic sounds
  • Hertz
  • Volume of Sound
    • You canmesaure the volume of sound with the unitcalled Decibel (dB)
    • There is a scale to seehow strong different sounds are
    • The scale is made so when the sound increases with 10 dB it’s 10 timesstronger
  • Volume of Sound
    • 90 dB  10 timesstrongerthan 80 dB, and 100 timesstrongerthan 70 dB
    • Butweperceiveloudnessdifferently, when the volumeincreases with 10 dB, wepercieve it as twice as strong instead of ten timesstronger
  • Decibel Scale
  • Sound With Different EmphasisHave Different Frequencies
  • The End