A ship has anchored in an ocean. The ocean is 10,500 m deep. An engineer from the ship sent a signal straight down into the water. How long will it take for the echo to reach him? (velocity of sound in water 1.5 km/s)
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Answer:
Time required to by the echo to reach him is 4.2 Sec. Explanation: Distance of Both Side : 10,500 + 10,500 = 21,000 m which is equal to 21 KM.
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Given - Depth: 10,500 m
velocity of sound in water 1.5 km/s
Find - Time taken for echo to reach the engineer
Solution - The echo will travel firstly from engineer to depth and then will come back from depth to engineer. Thus, the distance will be added up.
Total distance = 10500 + 10500
Total distance = 21000 metres
Total distance = 21 kilometres
Now, time taken = distance/velocity
Time taken = 21/1.5
Time taken = 14 seconds.
Hence, it will take 14 seconds for echo to reach the engineer.
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