Human ear is sensitive to 20 Hz to 20,000 Hz for sound waves. If these waves are propagating in water calculate the maximum and minimum wavelength. Consider the wave velocity of sound in water 1500 m/s.
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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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