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LEQ: What is Sonar, how does it work, and what did it help Geoscientists discover?

LEQ: What is Sonar, how does it work, and what did it help Geoscientists discover?. Key Terms: Echo, sonar. Sonar. Underwater So und N avigation A nd R anging . Used extensively during World War II. Uses sound waves and echos.

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LEQ: What is Sonar, how does it work, and what did it help Geoscientists discover?

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  1. LEQ: What is Sonar, how does it work, and what did it help Geoscientists discover? Key Terms: Echo, sonar

  2. Sonar • Underwater SoundNavigation AndRanging. • Used extensively during World War II. • Uses sound waves and echos. • Is used to determine the distance between two objects underwater.

  3. How Does Sonar Work? • A source sends out a sound wave. • The sound wave goes out and bounces off an object causing an echo. • The echo returns to the source. • The time it takes for the echo to return to the source is recorded. • The speed of sound in water is known. (1507 meters per second)

  4. Formula for Calculating Distance using Sonar • D= V ( .5 xT) • D = Distance • T = Time • V = Speed of sound in water • 1.507 km/sec

  5. What did Geoscientists Discover Using Sonar ? • After World War II, geoscientists used sonar as a tool to map the entire ocean floor. • Using sonar, geoscientists made an unexpected shocking discovery about the floor of the ocean that surprised the scientific community. • We will be doing an activity using calculated sonar data to see what was discovered. • Activity. • Wiki Data/Excel Spreadsheet • Use your group’s the “Mapping the Atlantic Ocean Floor Data” form to enter your data.

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