Echo receiver — task. Science CBSE Homework Assignments, Class 9.

The echo-receiver of a sonar attached to a ship, receives the echo from the bottom of sea \(4\ seconds\) after the ultrasonic waves were sent into the sea. If the speed of sound in water is \(1500\ m/s\), then what is the depth of the sea?

\(6000\ m\)
\(15000\ m\)
\(3000\ m\)
\(3500\ m\)

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2. Echo receiver

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