Correct Answer:
A. Solid
The question asks through which medium sound travels fastest. The correct answer is Solid. Sound waves are mechanical waves that require a medium to propagate by vibrating its particles. In solids, particles are much closer together and more tightly packed than in liquids or gases. This close proximity and strong intermolecular forces allow vibrations to be transmitted more efficiently and rapidly from one particle to the next, resulting in the fastest sound transmission.
- In Liquid, particles are further apart, leading to slower sound.
- In Gas, particles are widely dispersed, causing the slowest sound speed.
- Vacuum has no particles, so sound cannot travel at all.