ultrasound
Ultrasound lies above the normal human hearing range. This topic is part of Physics within Science & Nature. This page currently draws on 7 supporting questions, with answers and bonus facts available below.
ultrasound trivia questions
Ultrasound uses sound waves with frequencies above what humans can usually hear?
Answer: 20,000 Hz
Bonus fact: Ultrasound lies above the normal human hearing range.
Medical ultrasound forms images by analyzing what?
Answer: Returning sound echoes
Bonus fact: Echo timing and strength reveal tissue boundaries.
What effect is used in Doppler ultrasound to measure blood flow?
Answer: Doppler effect
Bonus fact: Frequency shifts reveal motion.
Ultrasound imaging uses what?
Answer: High-frequency sound waves
Bonus fact: Echoes create real-time images.
What device sends and receives ultrasound waves?
Answer: Transducer
Bonus fact: Piezoelectric elements convert electrical energy and sound.
Why is gel placed on the skin during many ultrasound exams?
Answer: To remove air between transducer and skin
Bonus fact: Air strongly reflects ultrasound and interferes with transmission.
Frequencies above the normal human hearing range are called what?
Answer: Ultrasound
Bonus fact: Ultrasound is commonly defined as above 20 kHz.