Physics 0625 · IGCSE · Light

Light — practice question

At what speed do electromagnetic waves travel through a vacuum?

  • A$300\ \text{m s}^{-1}$
  • B$300\ \text{km s}^{-1}$
  • C$300\,000\ \text{km s}^{-1}$
  • D$300\,000\,000\ \text{km s}^{-1}$

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