A surveyor’s device sends out a pulse of light. The light reflects off a wall $150\,\text{m}$ away. What is the time taken for the pulse to travel from the device to the wall and then back to the device?
- A$0.05\,\text{ns}$
- B$0.10\,\text{ns}$
- C$0.50\,\mu\text{s}$
- D$1.0\,\mu\text{s}$