When we go from a solid to a gaseous state, the speed of sound [[1]].

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Detailed Solution

When we go from a solid to a gaseous state, the speed of sound decreases.
The speed of sound in a solid medium is faster than the gases because the molecules in a solid medium are much closer together than the gases, allowing the sound waves to travel more quickly through it.
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The propagation of sound is by the molecules of the body. If the body is tightly packed, the travel of sound is faster.
●       The speed of the sound is fastest in solid, as the molecules of solid are tightly packed.
●       The speed of the sound is faster in liquid, as the molecules of sound are not closely packed and are not highly dispersed.
●       Speed of sound is slowest in gas. Because molecules of gas are highly scattered.

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