Physics (AS & A Level) · Oct / Nov 2018 · Paper 12 · Question 26

A surveyor's device emits a pulse of light. The light is reflected from a wall 150 m away. What is the time taken for the pulse to travel from the device to the wall and then back to the device?

1. A0.05 ns
2. B0.10 ns
3. C0.50 µs
4. D1.0 µs

As printed in the paper