Applications of Ultrasound

Identify the application. State that ultrasound is sent out. It reflects from a boundary or object. The receiver detects the echo. Use echo time or reflection pattern to find distance or form an image.

Draw a ship sending ultrasonic waves to the seabed or object, with reflected waves returning to the receiver. Label transmitter, receiver, seabed or object, and echo path.

Wrong answer: SONAR uses ultrasound because humans can hear it clearly underwater. This is wrong because ultrasound is above human hearing range.

Ultrasound applications use sound waves of frequency above 20,000 Hz for detection, imaging, cleaning, navigation, and measuring distances.

Ultrasound applications use sound waves of frequency above 20,000 Hz for detection, imaging, cleaning, navigation, and measuring distances. SONAR distance rule: distance = speed × echo time / 2, because the wave travels to the object and returns. In SONAR, a ship sends an ultrasonic pulse downward and receives its echo from the seabed to calculate depth.

Ultrasound is useful because it can be sent in a narrow beam and can reflect from small objects or boundaries. SONAR uses reflected ultrasound to find underwater objects or depth. Medical ultrasound forms images of internal organs by detecting reflections from body tissues. Bats use ultrasonic echoes to locate obstacles and prey. SONAR distance rule: distance = speed × echo time / 2, because the wave travels to the object and returns. A SONAR pulse returns after 4 s in water. If speed of sound in water is 1500 m/s, depth = 1500 × 4 / 2 = 3000 m. Questions may ask why ultrasound is used, how SONAR works, how bats navigate, or how medical ultrasound forms images. Wrong answer: SONAR uses ultrasound because humans can hear it clearly underwater. This is wrong because ultrasound is above human hearing range.