If the depth of the sea is 2 km the time taken by the reflected sound
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4/3 seconds
Explanation:
Speed of sound in water is approx. 1500m/s
sound travels 1km(1000m) to reach sea bed
so time taken to travel 1 km is 1000/1500 = 2/3 sec
time taken for sound to travel back is (2-1)*1000/1500 = 2/3 sec
total time taken is 2/3+2/3 = 4/3 seconds .
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