Multiple choice

which of the following statement is wrong about electromagnetic waves?

  1. they travel with the velocity of light in vacuum

  2. they are transverse in nature

  3. they travel with the same speed in all medium

  4. they are produced by oscillating charges
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Electromagnetic waves travel at speed c in vacuum, but their speed DECREASES in material media due to refractive index. They do not travel at the same speed in all media - this is why refraction occurs. Statements A, B, and D are all correct: EM waves travel at c in vacuum, are transverse, and are produced by oscillating charges.

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