Multiple choice Which of the following is NOT true about electromagnetic (EM) waves? they were discovered by James Clerk Maxwell they can travel through the vacuum of space they can only travel through solids and gases their fields run perpendicular to each other Reveal answer Fill a bubble to check yourself C Correct answer Explanation Electromagnetic waves do not require a medium; they can travel through the vacuum of space. Therefore, the statement that they can only travel through solids and gases is false.