1.

Explain briefly how SONAR can be employed to measure the depth of a sea

Answer»

A combinedtransmitterandreceiver, called atransducer, sends a soundpulsestraight down into the water. The pulse moves down through the water and bounces off the ocean bottom. The transducer is able to pick up the reflected sound. Computers precisely measure the time it takes for the sound pulse to reach the bottom and return. In shallow water the soundwaveswill return very fast and in deeper water it will take more time to receive the echoes. The depth of the ocean is calculated by knowing how fast sound travels in the water (approximately 1,500 meters per second). This method of seafloor mapping is calledechosounding.

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