(a) Why are sound waves called mechanical wav | vedclass

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(D) Sound waves are called mechanical waves because they require a material medium for their propagation and are produced by the vibration of particle

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(D) Sound waves are called mechanical waves because they require a material medium for their propagation and are produced by the vibration of particles of the medium about their mean position.Two practical applications of the reflection of sound are:$(i)$ Megaphones: Used to direct sound waves in a specific direction by multiple reflections.$(ii)$ Stethoscope: Used by doctors to listen to heartbeats by multiple reflections of sound through a tube.$(b)$ Let $t_1$ be the time taken by the stone to reach the water surface and $t_2$ be the time taken by the sound to travel back to the top.For the stone falling: $S = ut + \frac{1}{2}gt^2$$125 = 0 + \frac{1}{2} 	imes 10 	imes t_1^2$$125 = 5t_1^2 \implies t_1^2 = 25 \implies t_1 = 5 \ s$For the sound traveling back: $t_2 = \frac{	ext{Distance}}{	ext{Speed}} = \frac{125}{340} \approx 0.37 \ s$Total time taken to hear the splash $= t_1 + t_2 = 5 + 0.37 = 5.37 \ s$.

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