Discussion
The CORRECT statement among the following regarding electromagnetic waves is
Answer: A
The correct statement is that they can travel through vacuum.
Electromagnetic waves consist of oscillating electric and magnetic fields that sustain each other, so they need no material medium; light reaches us from the sun through the vacuum of space.
They contain both fields together, perpendicular to each other and to the direction of travel, so 'only electric' and 'only magnetic' are wrong, and so is 'require a medium'. Their speed in vacuum is \(3 \times 10^{8}\) m s-1; the last option gives the unit as cm s-1, which is a hundred times too small.
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