Physics 0625 · IGCSE · Light

Light — practice question

The Moon lies $380\,000\,\text{km}$ away from the Earth. A laser light beam is aimed from the Earth towards the Moon. The beam is then reflected back to the Earth. How long does the light take to go 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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