Physics
Physics
Problem
Answer the following questions about ultrasonic waves: a. (i) Define ultrasound. b. (ii) State any four physical properties of ultrasonic waves. c. (iii) List any four practical applications of ultrasound in medicine or industry.Intuitive explanation
Ultrasonic waves are sound waves with frequencies above human hearing ( 20 kHz), and they behave like any other wave—they reflect, refract, and attenuate as they travel through materials. The key insight is that higher frequency means shorter wavelength, which lets ultrasound probe tiny structures and create sharp images, but also means it gets absorbed more quickly. Understanding how ultrasound interacts with different materials—especially the impedance mismatch at boundaries—unlocks why it's so useful in medical imaging and nondestructive testing.
Intuitive explanation
Ultrasonic waves are sound waves with frequencies above human hearing ( 20 kHz), and they behave like any other wave—they reflect, refract, and attenuate as they travel through materials. The key insight is that higher frequency means shorter wavelength, which lets ultrasound probe tiny structures and create sharp images, but also means it gets absorbed more quickly. Understanding how ultrasound interacts with different materials—especially the impedance mismatch at boundaries—unlocks why it's so useful in medical imaging and nondestructive testing.