Sound Waves


 
 
Concept Explanation
 

Sound Waves

Sound :

Sound waves are longitudinal waves. It originates from vibrations in objects, but not all vibrations produce sound. The waves that have a frequency of between 20 vibrations per second to 20,000 vibrations per second, we feel them through our ears and we can second, we feel them through our ears and we can hear them.

  • our ears are not sensitive to mechanical waves whose frequency is more or less than this range and we do not feel the sound from them.
  • Therefore, the word sound is used only for those waves, which we feel by our ears. The range of frequency of sound waves can vary for different humans.
  • Speed of sound

  • Speed of sound :- Speed of sound varies in different mediums. The speed of sound in a medium depends .on the elasticity (E) and density (d) of the medium. Newton first proved by theoretical calculation that the elasticity coefficient of a medium is E and density d, then the velocity of longitudinal waves in that medium v=sqrt{E/d}. If the medium is a solid rod, then the longitudinal wave speed v=sqrt{Y/d} where Y is the elasticity coefficient and if the medium is a fluid or gas, then the longitudinal waves speed v=sqrt{B/d}.
  • Newton's view of gases was that when longitudinal waves move in a gas, the heat of the gas is constant. Therefore, the value of the isotherm-al Bulk Modulus B of the gas isothermal volume is equal to the initial pressure
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