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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 77s. What is the distance of the enemy submarine ? (Speed of sound in water $=1450 \mathrm{~ms}^{-1}$ ).
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Solution:
2033 Upvotes Verified Answer
Here $t=77 \mathrm{~s}, V=1450 \mathrm{~ms}^{-1}$
Distance of enemy submarine
$$
=\frac{V \times t}{2}=\frac{1450 \times 77}{2}=55825 \mathrm{~m} \text {. }
$$

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