Question

The sound waves travel fastest :

(a) in solids

(b) in liquids

(c) in gases

(d) in vacuum

Answer 1

Sound waves travels fastest in solids .
because
In solids, the particles are tightly packed and the space of separation between them is less i.e the density is more. And 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, which means its speed will be high.