Ultrasound

• What is ultrasound?

  Sound waves with frequency above 20,000 Hertz
• What is the frequency range of normal human hearing?

  20 Hertz to 20,000 Hertz
• How do ultrasound waves behave at boundaries of different densities?

  They partially reflect at the boundary
• How can we calculate the distance to an object using ultrasound?

  By measuring the time for the pulse to return
• What organs can ultrasound scanners produce images of?

  Internal organs not surrounded by bone
• Why is ultrasound considered safer than x-rays?

  It does not cause mutations or increase cancer risk
• How is ultrasound used in industrial imaging?

  To detect hidden defects in welds
• What is the equation to calculate distance using ultrasound?

  Distance = speed × time
• If an ultrasound pulse takes 1.2 seconds to return, what is the total distance traveled if the speed is 1600 m/s?

  1920 meters
• How do you find the depth of the seabed from the total distance traveled by ultrasound?

  Divide the total distance by 2
• What is the depth of the seabed if the total distance is 1920 meters?

  960 meters
• What are the applications of ultrasound in medicine and industry?

  • Medical imaging of internal organs
  • Imaging of fetuses
  • Detecting defects in industrial welds
• How do you calculate the depth of the seabed using ultrasound?

  1. Use the equation: Distance = speed × time
  2. Calculate total distance traveled
  3. Divide total distance by 2 for depth