Answer: Solid medium
- The speed of sound is the distance that any sound travels per unit of time.
- The molecules in the medium are tightly packed when the medium is dense, that implies the sound travels faster.
- Therefore, as the medium density increases, the speed of sound increases.
- In solids, the molecules are closer to one another than in liquids and in liquids than in gases.
- This closeness due to density implies that very easily they will collide.
- A liquid’s density is greater than the density of a gas.
- The gaps between molecules are also greater in liquids than in solids but less than in gases.
- The speed of sound in liquids is therefore found between the speed of sound in solids and gases.
- Density is very uniform irrespective of the nature of gas because gases expand to occupy the given space.
The velocity of sound in various medium
We may assume, from the above discussion, the sound velocity varies as shown below in the various mediums.
- Sound moves quickly in solids as compared to air, fluid or vacuum.
- Sound moves at a higher rate via denser media.
- The density of the solid is greater than the densities of air, liquid & vacuum.
- Sound velocity in the medium of Vacuum < medium of gas < medium of liquid < medium solid.