GCSE Physics (AQA)

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Sonar

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Waves Waves in air, fluids and solids

Sonar

2:39 Applications of Mechanical Waves
Spec 4.6.1.5
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  • Sonar is a detection system using ultrasound waves for scanning below the ocean surface.
  • Sonar devices on ships detect underwater objects, represented as dots on a display indicating direction and depth.
  • Some sonar devices generate full maps instead of detecting individual objects.
  • Sonar works by sending ultrasound waves into the water, which reflect back upon reaching the seabed.
  • A computer calculates the distance of objects by timing the return of the waves.
  • Multiple beams in different directions help map the seabed by measuring various depths.
  • Sonar is used for mapping seabeds, planning shipping routes, naval reconnaissance, detecting submarines, and tracking schools of fish.
  • Marine biologists use sonar to track and study whales and other large aquatic animals.
  • Understanding the sonar process is important for exams, though recalling specific uses is not necessary.

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