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Physics · May / June 2018 · Paper 11 · Question 1

5054Electromagnetic spectrum

Which statement about electromagnetic waves is correct?

  1. AAll electromagnetic waves have speeds in air of approximately 3 × 10^8 m / s.
  2. BIn air, some electromagnetic waves travel faster than light.
  3. CThe electromagnetic waves with the largest wavelength are in the infra-red region.
  4. DThe electromagnetic waves with the smallest wavelength are in the X-ray region.

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Correct answer: A. All electromagnetic waves have speeds in air of approximately 3 × 10^8 m / s.

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