. Sound waves of wave length X travel from a medium in which velocity is V m/s into another medium in which if velocity is 3 m/s is the wavelength of sound distance travelled in the second medium.
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When an object vibrates, it sets the particles of the medium around it vibrating. The particles in the medium in contact with the vibrating object displace from its equilibrium position. It then exerts force on the adjacent particles. After displacing the adjacent particle the first particle of medium comes back in its original position. This process continues in the medium till the sound reaches your ear.
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