Sonar Sound
Sonar Sound
SONAR: The word SONAR stands for Sound Navigation And Ranging. Sonar is an apparatus used to find the depth of a sea or to locate the underwater things like shoals of fish, shipwrecks and enemy submarines. It uses ultrasonic waves to measure the distance, direction and speed of underwater objects. SONAR consists of two parts:
1. a transmitter (for emitting ultrasonic waves)
2. a receiver (for detecting ultrasonic waves)
| The transmitter produces and transmits ultrasonic wave. These waves travel down the sea-water towards the bottom of the sea. When the ultrasonic sound pulse strikes the bottom of the sea, it is reflected back in the form of echo aid are sensed by the detector. The detector converts the ultrasonic waves into electrical signals which are appropriately interpreted. The distance of the object that reflected the sound wave can be calculated by knowing the speed of sound wave in water and the time interval between transmission and reception of the ultrasound. |  |
This will give us the depth of the sea. Let the time interval between transmission and reception of ultrasound signal be ‘t’ and the speed of sound through sea-water be ‘v;. The total distance, 2d travelled by the ultrasound is, then
2d = v x t
This method is called echo-ranging.
SONAR is used determine the depth of the sea and to locate underwater hills, valleys, submarine, ice-bergs, sunken ship, etc.
If the depth of the sea is 1.125 km, the time taken for the reflected sound to raech the sonar is _____ s. ( velocity of sound in water is 1500 m | |||
| Right Option : B | |||
| View Explanation | |||
The velocity of ultrasonic in water is 1400m/sec . The depth of the ocean as delete by, SONAR, if the time taken to receive the reflected wave is 15 second . | |||
| Right Option : B | |||
| View Explanation | |||
Ultrasonics are used in sonar with greater advantage, because ultersonics | |||
| Right Option : C | |||
| View Explanation | |||
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