Physics for IGCSE & O level - Waves And Sounds (Section 2 - No. 44)
If a boat uses ultrasound and pulses take 0.02 seconds to travel from the boat to the seabed and back, what is the water depth (assuming the speed of sound is 1400 m/s)?
7 m
14 m
28 m
56 m
Explanation
Depth = 1/2 * speed * time = 0.5 * 1400 m/s * 0.02 s = 14 m.
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