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 travels through a medium via particle - to - particle collisions. When the temperature of a medium increases, the kinetic energy of the particles increases. This causes the particles to move faster and bump into each other more often, which allows the sound wave to be transmitted more quickly.

Answer:

increases because the particles bump into each other more often.