Question

why speed of sound is maximum in solids​

Answer 1

Answer:

Because they are so close, than can collide very quickly, i.e. it takes less time for a molecule of the solid to 'bump' into its neighborough. Solids are packed together tighter than liquids and gases, hence sound travels fastest in solids. The distances in liquids are shorter than in gases, but longer than in solids.

Answer 2

Answer:

This is because molecules in solid are much closer together than those a liquid or gas allowing sound waves to travel fast.