Physics for IGCSE & O level - Waves And Sounds (Section 2 - No. 36)
In the context of ultrasound, what is the depth of water if the pulse takes 0.1 seconds to travel to the sea-bed and return, and the speed of sound in water is 1400 m/s?
70 m
140 m
280 m
700 m
Explanation
Depth of water = 1/2 * (speed * time) = 1/2 * (1400 m/s * 0.1 s) = 70 m
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