Answer:
gas
solids
Explanation:
The speed of sound depends upon the properties of the medium it is passing through
sound waves travel
Why fastest in solids?
Sound is a spherical longitudinal wave. It propagates through compressions and refractions of particles
In solids, the particles are tightly packed and the space of separation between them is less.So, the time taken for a particle to collide with another is comparatively less because they have to travel a relatively short distance with their velocity.
Therefore, there are more collisions per second and particles move faster causing the wave to propagate faster
But in gases sound takes a larger time to propagate because the molecules of gases are far apart from each other
