Multiple choice

Which wave requires a medium for transmission?

  1. Light

  2. Infrared

  3. Radio

  4. Sound

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sound waves are mechanical waves, which propagate through the vibration of particles in a medium (solid, liquid, or gas) and therefore cannot travel through a vacuum. Light, infrared, and radio waves are electromagnetic waves, which do not require a medium and can travel through empty space.