What type of medium makes sound travel the fastest and explain why.

Solid medium helps sound waves to travel the fastest since the molecules inside a solid are closer to one another, allowing better transmission.

Explanation :

Talking about the motion of sound waves through the three phases of mediums (solid, liquid and gas), sound waves chose to be the fastest while travelling through the solid media.

Because in solids, the molecules are stacked closely to one another, allowing the transmission of sound waves faster as compared to the liquids or gases.  In fact in air, the sound waves find clumsy to travel.

Sound waves travel about 17 times faster in steel than through air.  Although there are always some exceptions yet, most of the solids provide better transmission of sound waves as compared to other mediums.

a

explanation:

no diagram was provided, but i'm guessing it's the one i've attached to my answer.

here, a mechanical force turns the rod.   this generates an electric current in the coil, which powers the bulb.