Question

does sound travel faster or slower with more molecules

Answer 1

Sound is a mechanical wave and travels by compression and rarefaction of the medium (which is what the wave travels through for ex. air or water). Its velocity in an elastic medium is proportional to the square root of Tension in the medium. A higher density leads to more elasticity in the medium and hence the ease by which compression and rarefaction can take place. This way the velocity of sound increases by increase in density.

Answer 2

Physics?

Answer 3

More molecules means more density.

Answer 4

so it moves faster

Answer 5

Yes. It moves faster.