Propagation of Sound


 
 
Concept Explanation
 

Propagation of Sound

Propagation of sound  The travelling of sound is called propagation of sound. Sound cannot propagates in absence of medium (vaccum).

Sound needs a medium to propagate (travels). Sound travels through solid, liquid and gas.

  • The distance between molecules in solids is very small. The molecules of solids are colliding very quickly because they are closely packed  so hence sound travels faster in solid.
  • The distance between molecules in liquid are longer than solids, so sound travels second fast in liquid.
  • The distance between molecules in gases is large. So sound travels very slow in gases.
  • If some explosion takes place on moon, sound of the explosion will not be propagated to the earth, because moon has no atmosphere. The sound waves never reach the Earth. 
  • The medium must posses the following properties for the propagation of waves.

  • The medium should be able to return to its original position after being disturbed, i.e. the medium must have interia.
  • The medium must be capable of storing energy i.e. the medium must have interia.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1
    Column I Column II
    a) Mechanical waves p) Disturbance for short time
    b) Pulse q) Independent of amplitude of vibrations
    c) Velocity of sound in air r) SONAR
    d) Tracking of fish in ocean s) Require a material medium

     

    Right Option : A
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    Explanation
    Question : 2

    A sound wave :

    Right Option : A
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    Explanation
    Question : 3

    At what temperature of air will the speed of sound be double the speed at 293 K.

    Right Option : D
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    Explanation
     
     


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