Question

as the temperature of a medium increases, the speed of the sound wave
increases because the particles bump into each other more often.
increases because the particles bump into each other less often.
decreases because the particles bump into each other more often.
decreases because the particles bump into each other less often.

Explanation:

Sound is a mechanical wave that travels through a medium by the vibration and collision of particles. When the temperature of a medium increases, the kinetic energy of the particles in the medium increases. This causes the particles to move faster and bump into each other more often. Since sound propagation depends on these particle - to - particle interactions (collisions), more frequent collisions mean that the sound wave can be transmitted more quickly through the medium.

Answer:

increases because the particles bump into each other more often.