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A dolphin in 25C sea water emits a sound directed toward the bottom of the ocean 467 m below. How much time passes before it hears an echo?

A dolphin in 25◦C sea water emits a sound
directed toward the bottom of the ocean 467
m below.
How much time passes before it hears an
echo? The speed of sound in sea water is
1530 m/s.
Answer in units of s.

This question was asked on May 25, 2010.

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