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Sound Waves. What is Sound?. Sound is caused by a vibration of atoms in pulses. Each sound wave pulses with a certain frequency. The vibration pulse causes areas of compressions and rarefactions in the atoms of the medium. http:// www.youtube.com/watch?v=J2BUvWRCBGM

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Presentation Transcript
what is sound
What is Sound?
  • Sound is caused by a vibration of atoms in pulses. Each sound wave pulses with a certain frequency. The vibration pulse causes areas of compressions and rarefactions in the atoms of the medium.
  • http://www.youtube.com/watch?v=J2BUvWRCBGM
  • Sound is a longitudinal /compressional wave, which is a type of mechanical wave.
  • Sound waves can be caused by transverse waves such as those produced when you pluck or strum a guitar string. The energy in the transverse wave is transferred into a longitudinal wave; each crest creates an area of compression in the air around the string.
  • http://www.youtube.com/watch?v=TKF6nFzpHBU
properties and observations
Properties and Observations
  • Speed
  • Wavelength
  • Frequency
  • Amplitude
  • Pitch
  • Loudess
speed of sound
Speed of Sound
  • Sound waves travel the best in solids and worst in air.
  • The closer together the atoms are, the faster the sound will travel.
  • Sound will not travel in a vacuum, such as space because there is no matter/medium for the wave to vibrate.
pitch
Pitch
  • Pitch is determined by frequency.
  • The higher the frequency the higher the pitch.
  • Each pitch as a set frequency therefore to change pitch one must change wavelength or speed.
loudness
Loudness
  • Loudness is a result of amplitude of the sound wave.
  • The more energy you put into the sound wave the higher the amplitude and the louder the sound.
  • The high the amplitude the louder the sound. This is why amplifiers make sound louder.
wavelength and frequency
Wavelength and Frequency
  • Since speed is controlled by the medium the wave is travelling through:
  • When the speed is constant (no change in medium) in order for pitch to change the frequency must change, in order to change frequency the wavelength must change.
    • As wavelength increases frequency decreases, which causes pitch to decrease.
    • As wavelength decreases frequency increases, which causes pitch to increase.
medium and frequency
Medium and Frequency
  • When the medium in which the wave is travelling changes the speed changes.
  • When the speed changes the wavelength and frequency change inversely and create a different pitch.
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