V. Numerical Problems 1. In a submarine equipped with sonar, the time delay between the generation of a pulse and its echo after reflection from an enemy submarine is observed to be 80 s. If the speed of sound in water is 1460 ms-!. What is the distance of enemy submarine?
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in a submarine equipped with sonar , the speed of sound under water , distance of enemy submarine and time is related as v = 2d/t
Here v is the speed of sound in water , d is the distance of enemy submarine and t is the time.
Given,
v = 1460 m/s , t = 80 sec
∴ d = vt/2 = 1460 × 80/2 = 1460 × 40 = 58400 m = 58.4 km
Hence , distance of enemy submarine = 58.4 km
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