Multiple choice general knowledge science & technology

Which of the following always need a MEDIUM to propogate?

  1. light

  2. sound

  3. micro wave

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

Sound waves are mechanical waves that require particles to vibrate, so they need a material medium (solid, liquid, or gas) to travel. Light, microwaves, and radio waves are electromagnetic waves that can propagate through vacuum as they do not require any medium.

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