Physics 0625 · IGCSE · Light

Light — practice question

The Moon lies $380\,000\ \text{km}$ away from the Earth. A laser light beam is sent from the Earth towards the Moon. The beam then reflects back to the Earth. How long does it take for the light to make the journey to the Moon and return to the Earth?

  • A$1.27\ \text{ms}$
  • B$2.53\ \text{ms}$
  • C$1.27\ \text{s}$
  • D$2.53\ \text{s}$

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