An object is 11km below sea level. A ship sends down a sonar signal to confirm how deep the object is. After how long can it expect to get the echo? (Take the speed of sound in sea water as 1520ms−1.)
A
15.30s
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B
14.47s
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C
12.20s
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D
11.13s
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Solution
The correct option is B14.47s The total distance travelled by the sonar signal from the ship to the sea bed and back: s=2×11km=22,000m
Speed of sound in water, v=1520ms−1
Time taken by the sound to travel this distance is: t=sv t=220001520=14.473s
Hence, the echo will reach the ship 14.47s after the signal is sent.