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Why do longitudinal sound waves need molecules of a medium to travel?

1. Molecules of a medium are needed to be aligned synchronously for a sound wave to travel, thus essential.
2. Molecules of a medium are needed to be disturbed for a sound wave to travel, thus essential.
3. Because the emission or transmission of energy happens in the form of only light or space.
4. For sound waves to travel, the particles in the medium are needed to join together to create a greater mass.

Correct answer: Molecules of a medium are needed to be disturbed for a sound wave to travel, thus essential.

Solution

Sound travels as a disturbance passed from one particle of the medium to the next, creating compressions and rarefactions. Since this transfer requires particles, sound cannot travel through vacuum.

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