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Explain the working an application of SONAR. (Sound)

Dear Student,

Please find below the solution of your asked query:

Working-

SONAR stands for sound navigation and ranging . SONAR is a device which is used by ships and submarines to locate position of other vessels in the ocean. These are of two types. One is passive, which only detects the incoming. Another one is active SONAR which transmits sound pulses and detects the reflected echoes to detect presence of other sea vessels.

Principle behind SONAR is reflection of sound.

The sound sent is reflected back from the sea bed which is known as echo.

Let the depth of the ocean be D

For perpendicular focusing of the sonar

V = 2D/t

=>D = Vt/2

Where V = speed of sound in water

t = time after the echo is detected.

Thus, depth of the ocean is evaluated.

Applications-

  • Sonar is a very useful technique which can help determine what lies beneath the ship, boat or a submarine. It has been used to discover shipwrecks, lost treasures, sunken features etc.
  • It is also used in military for detecting the presence of enemy ships.
Hope this information clears your doubts about the topic.

Keep asking!!

Regards

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NCERT Q19 - Explain the working and application of a sonar.
Sonar is installed in a boat or a ship. The transmitter transmits ultrasonic waves. These waves travel through water and after striking the object on the seabed, get reflected back and are sensed by the detector. The detector converts the ultrasonic waves into electrical signals, which are later interpreted.SONAR stands for SOund Navigation And Ranging.

Working of SONAR:-

It is a device that uses ultrasonic waves to measure the distance , direction and speed of underwater objects.
The transmitter produces and transmits ultrasonic waves. These waves travel through water and after striking the object on the seabed, get reflected back and are sensed by the detector. The detector converts the ultrasonic waves into electrical signals which are appropriately interpreted.

Application of SONAR:-

• Detecting & tracking submarines, ships, etc.

• Mapping the ocean floor.

• Detecting under-water mines.
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