Physics 0625 · IGCSE · Light

Light — practice question

Approximately what is the speed of light in air?

  • A$300\,\text{m s}^{-1}$
  • B$300\,\text{km s}^{-1}$
  • C$3.0 \times 10^8\,\text{m s}^{-1}$
  • D$3.0 \times 10^8\,\text{km s}^{-1}$

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