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The velocity of sound is highest in

Sound waves need a medium to travel. Vacuum does not provide any medium to sound waves. This is the reason why we are not able to listen anything in space. The velocity of sound waves depends on the density of the material medium. Higher the density, higher the velocity of sound waves. As glass is denser than air and water therefore velocity will be more in glass.

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Fill in the blanks with suitable words :

The product of frequency and wavelength of a sound wave is equal to its ___________ .