3. The deepest recorded point below the sea level is in the
mariana trench, pacific Ocean. This point is 11km
below the sea level. A research vessel sends down a sonar signal to confirm this depth. After how long can
it expect to get the echo? Take the speed of sound in sea water as 1520 m/s.
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The Challenger Deep, in the southern end of the Mariana Trench (sometimes called the Marianas Trench), is the deepest spot in the ocean. Its depth is difficult to measure from the surface, but modern estimates vary by less than 1,000 feet (305 meters)
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