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Sound


Wavelength of Sound Waves

  • distance between successive crests

Amplitude of Sound Waves

  • vertical height of the wave
  • loudness or volume
  • measured in decibels

Frequency of Sound Waves

  • the number of cycles or waves passing a given point every second
  • pitch
  • measured in hertz (Hz)

Frequency of Human Hearing

  • between 15 000 and 20 000 Hz

Speed of Sound

  • 344 m/s at 20oC in dry air (also called Mach 1)
  • Sound travels faster in solids than in liquids than in gases

SUBSTANCE

STATE AT ROOM TEMPERATURE

SPEED OF SOUND (m/s)

dry air gas 344
helium gas 965
kerosene liquid 1324
distilled water liquid 1497
sea water liquid 1531
cork solid 500
pine solid 3320
glass solid 4540
aluminium solid 5000
brass solid 3480