Waves and the Earth - Sonar

The video explains sonar technology, its historical use in locating the Titanic, and how it works by emitting sound waves and analyzing their echoes to determine the depth of submerged objects. It provides a calculation example using sonar to find the depth of the Titanic wreck and discusses sonar's applications in fishing and shipwreck detection.

What tragic event is associated with the use of sonar technology in its early days?

• The sinking of the Titanic

• The discovery of Atlantis

• The eruption of Krakatoa

• The fall of the Berlin Wall

How does sonar determine the depth of an object underwater?

• By detecting temperature changes

• By using magnetic fields

• By calculating the time lapse of sound waves

• By measuring the light reflection

What is the speed of sound in water used for sonar calculations?

• 2,500 meters per second

• 2,000 meters per second

• 1,500 meters per second

• 1,000 meters per second

If a sonar pulse takes 5 seconds to return, what is the depth of the object?

• 1,500 meters

• 3,750 meters

• 7,500 meters

• 10,000 meters

Apart from finding shipwrecks, what is another use of sonar technology?

• Measuring air pressure

• Finding oil reserves

• Detecting earthquakes

• Locating fish and determining their size