O-LevelPhysicsWaves5054/12 · Oct/Nov 2018 · Q271 Mark
Ultrasound is used to map the ocean floor. During one survey, the depth of water is 1200 m. An ultrasound pulse is sent from the surface and when it returns to the ship, another pulse is sent immediately. In any period of 8.0 s, five pulses are sent down from the surface. What is the speed of the ultrasound in water?
A150 m/s
B300 m/s
C750 m/s
D1500 m/s
✓ Correct answer
D: 1500 m/s
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