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Which of the following is used to find the depth of the sea-bed?

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in Engineering Physics II by (679k points)
Which of the following is used to find the depth of the sea-bed?

(a) Laser method

(b) Sonar method

(c) Radar method

(d) Reflection or echo method

This question was addressed to me in my homework.

Enquiry is from Units and Measurements in chapter Advanced Engineering Materials of Engineering Physics II

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The correct option is (b) Sonar method

Easy explanation: The word sonar stands for sound navigation and ranging. On a sonar ultrasonic waves are transmitted through the ocean. They are reflected by the submerged rocks and received by the receiver. By measuring the time delay of the receipt, the distance can be determined.

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