A submarine sends a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?


The time taken by the sonar pulse to go from the submarine to cliff will be half of this time:

=


= 0.51 second


We know that,


Speed =


1531 =


Distance = 1531 × 0.51


= 780.8 m


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