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# A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff? - CBSE Class 9 - Science

ConceptApplications of Ultrasound - SONAR

#### Question

A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

#### Solution

Time taken by the sonar pulse to return, = 1.02 s

Speed of sound in salt water, = 1531 m s−1

Total distance covered by the sonar pulse = Speed of sound × Time taken

Total distance covered by the sonar pulse = 1.02 x 1531 = 1561.62 m       .....(i)

Let d be the distance of the cliff from the submarine.

Total distance covered by the sonar pulse = 2d

rArr 2d=1561.62"                       [From (i)]"

rArrd=780.81 m

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Solution A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff? Concept: Applications of Ultrasound - SONAR.
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