O-LevelPhysicsWaves5054/12 · Oct/Nov 2014 · Q181 Mark
A student stands at a distance d from the base of a tall cliff. He claps together two pieces of wood and measures the time that elapses before he hears the echo. He conducts the experiment five times and obtains these results. 0.72 s 0.80 s 0.71 s 0.81 s 0.71 s The speed of sound is 320 m/s. What is the distance d?
A120 m
B240 m
C480 m
D600 m
✓ Correct answer
A: 120 m
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