Sound Waves

Monday, 11 June 2018

12:28 PM

A sound wave may be considered as a displacement wave or a pressure wave

 

 

 and  are out of phase by  ()

 

 

Speed of Sound (liquid or gas)

 - bulk modulus

 - density

 

 on a string

 

Speed of Sound (air)

 

 

 

Intensity of Periodic Sound Waves

 

 

Since

 

Three-dimensional intensity

 

Sound Levels (decibels)

The range of intensities  detectable by the human ear is around

It is therefore convenient to use a logarithmic scale to describe sound level

 - decibel

 - actual intensity

 - reference intensity