Multiple choice general knowledge science & technology

All waves except ______ waves must travel through a medium.

  1. sound

  2. light

  3. water

  4. compressional
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electromagnetic waves (including light) are unique because they can travel through a vacuum without any medium. All other waves listed (sound, water, compressional) are mechanical waves that require a material medium to propagate. Light waves self-propagate via oscillating electric and magnetic fields.

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