O-LevelPhysicsLight5054/11 · May/June 2018 · Q11 Mark
Which statement about electromagnetic waves is correct?
AAll electromagnetic waves have speeds in air of approximately 3 × 10⁸ m/s.
BIn air, some electromagnetic waves travel faster than light.
CThe electromagnetic waves with the largest wavelength are in the infra-red region.
DThe electromagnetic waves with the smallest wavelength are in the X-ray region.
✓ Correct answer
A: All electromagnetic waves have speeds in air of approximately 3 × 10⁸ m/s.
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