When & why SONAR technique was developed ?
Answers
Answer:
The earliest uses of solar power included focusing the sun's energy through a magnifying glass to start fires for cooking. By the 3rd century B.C., Greeks and Romans bounced sunlight off of “burning mirrors” to light sacred torches for religious ceremonies.
Answer:
Sonar (sound navigation and ranging) is a technology that uses acoustical waves to sense the location of objects in the ocean. The simplest sonar devices send out a sound pulse from a transducer, and then precisely measure the time it takes for the sound pulses to be reflected back to the transducer. The distance to an object can be calculated using this time difference and the speed of sound in the water (approximately 1,500 meters per second). More sophisticated sonar systems can provide additional direction and range information. Sonar was developed during World War I as an aid in finding both submarines and icebergs. Major improvements were made on this technology during World War II, and eventually scientists adapted the highly sensitive equipment for use in oceanographic research.