Properties of Sound. Pitch Loudness Speed in Various Media.

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Presentation transcript:

Properties of Sound

Pitch Loudness Speed in Various Media

Pitch, or Tone Pitch is directly related to frequency. Range of Human Hearing 20 Hz – 20,000 Hz Sonic Range

Infrasonic Below 20 Hz Above 20,000 Hz Ultrasonic

Loudness The human ear is not a linear device. It is logarithmic.

Log Graph

Decibels The unit of loudness is the decibel, 1/10 of a Bel (named after Alexander Graham Bell)

Logarithmic Hearing The decibel scale is logarithmic, which means that an increase of 10 dB is a 10 time increase in intensity.

Decibel Equation

Intensity

Increase in Intensity Intensity Increase

Speed of Sound in Media The speed of sound is directly related to the elasticity of a medium. The speed of sound in a medium is indirectly related to the density of the medium.

Graphic

General Rule for Speed of Sound in Media GasSlowest LiquidMedium SolidFastest

Speed of Sound in Air