I recently read a book that explained why the speed of sound is faster through a medium with a higher density.
It said -
In a denser medium, the particles are closer together. This means that there is a stronger restoring force so the vibrations are passed more rapidly from one particle to another
I am confused by the statement There is a stronger restoring force which results in the vibrations being passed more strongly.
How does a stronger restoring force cause this? I know that in a denser medium, there are more particles, hence the vibrations can be passed faster from one end to another, but I don't understand how the restoring force is involved.