Ultrasound

• What is the frequency range of ultrasound?

  Above 20,000 Hertz
• How do humans produce ultrasound?

  Using electrical devices to create oscillations
• What happens when ultrasound hits a boundary between two mediums?

  Some waves are reflected, some transmitted
• How can we determine the distance to a boundary using ultrasound?

  By knowing speed and reflection time
• Why is ultrasound considered safe?

  It does not involve harmful radiation
• What is a common use of ultrasound in medicine?

  Scanning fetuses during pregnancy
• How does ultrasound imaging work for fetuses?

  It processes echoes to create live images
• What indicates a fault in an industrial product using ultrasound?

  Unexpected reflected waves from cracks
• What is echo sounding also known as?

  Sonar
• How do submarines use ultrasound?

  To detect objects and measure distances underwater
• If a submarine detects reflected waves after 6 seconds, what is the speed of sound used?

  1400 meters per second
• How do you calculate the distance to the seafloor using ultrasound?

  Distance = speed × time
• What is the actual distance from the submarine to the seafloor if the total distance is 8,400 meters?

  4,200 meters
• What are the applications of ultrasound technology?

  • Prenatal scanning
  • Industrial imaging
  • Sonar for underwater detection
• What is the process of ultrasound imaging in detail?

  1. Ultrasound waves are emitted.
  2. Waves hit boundaries and reflect.
  3. Reflected waves are detected.
  4. Time taken for echoes is measured.
  5. Computer processes data to create images.