Multiple choice

Which of the following is NOT true about electromagnetic waves?

  1. they do NOT need a medium to travel

  2. the do NOT lose energy as they travel

  3. the DO need a medium to travel

  4. they travel slower through a medium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electromagnetic waves are unique because they do NOT require a medium to propagate; they can travel through vacuum (like light from the Sun). Option C states they DO need a medium, which is false, making it the correct answer to a NOT-true question. Option A describes this true property incorrectly marked as false. Option D is true because EM waves do travel slower through denser media due to interactions.

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