Question

Find the speed of a sonar pulse that returns in 4 s from a sunken ship at 2800 m depth.

Answer 1

speed= distance

_______

time

speed= 2800

_____

4

speed= 700 m/ s

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Answer 2

Question:

Find the speed of a SONAR pulse that returns in 4 seconds from a sunken ship at 2800 metres depth.

Answer:

The speed of the SONAR pulse is 1400 m/s.

Given:

The time taken by the SONAR pulse to return is 4 seconds.

The ship is at a depth of 2800 metres.

To find:

The speed of the SONAR pulse.

Explanation:

The ship is at a depth of 2800 metres.

∴ The distance travelled by ship = (2800×2) metres[The wave goes to the ship and again returns to it position by acrossing same distance.]

                                                    = 5600 metres.

The time taken by the pulse to return is 4 second.

∴ Total time = 4 second [∵ In case of pulse the time is calculated from the time when it is released and is said to be the time to return.]

We know that,

Speed = (Distance/Time)

          = (5600/4)

          = 1400 m/s.

∴ The speed of the SONAR pulse is 1400 m/s.