A surveyor’s instrument sends out a laser pulse. How long does the pulse take to travel from the instrument to a wall $150\,\text{m}$ away, bounce off it, and then return to the instrument?
- A$0.05\,\text{ns}$
- B$0.10\,\text{ns}$
- C$0.50\,\mu\text{s}$
- D$1.0\,\mu\text{s}$