Question

Where do sound waves travel faster? (1 point)
through less dense materials, because the molecules in a loosely packed medium collide less frequently
through denser materials, because the molecules in a tightly packed medium collide more frequently
through denser materials, because the molecules in a tightly packed medium collide less frequently
through less dense materials, because the molecules in a loosely packed medium collide more frequently

Answer 1

through denser materials, because the molecules in a tightly packed medium collide more frequently

(Brief note: more generally speed = sqrt(elasticity/density); in solids/denser media the elastic restoring forces are larger, so disturbances propagate faster.)