A-LevelPhysicsWaves9702/12 · Oct/Nov 2018 · Q261 Mark

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?

A0.05 ns

B0.10 ns

C0.50 µs

D1.0 µs

✓ Correct answer

D: 1.0 µs

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