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Question

Sound travels in air if

A
particles of medium travel from one place to another
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B
there is no moisture in the aimosphere
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C
disturbance moves
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D
both particles as well as disturbance travel from on e place to another.
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Solution

The correct option is D disturbance moves
Sound is a mechanical wave that results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through air, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. The motion of the particles is parallel (and anti-parallel) to the direction of the energy transport. Here, the sound wave does not move the particles of the medium from one place to another but only the vibration or the disturbance moves.

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