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  4. A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a sonar the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine?

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Q. A $SONAR$ (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a sonar the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be $77.0\, s$. What is the distance of the enemy submarine?

Physical World, Units and Measurements

Solution:

Distance of enemy submarine
$=\frac{\text { distance travelled by SONAR }}{2}=\frac{1450\, ms ^{-1} \times 77 s }{2}$
$=55825 \,m =55.8\, km$