General Science • PhysicsEasy
Which of the following waves requires a material medium for its propagation and cannot travel through a vacuum?
A. Radio waves
B. X-rays
C. Ultrasonic waves✓ Correct Answer
D. Ultraviolet rays
💡 Solution & Explanation
Ultrasonic waves are mechanical vibrations that require a physical medium to transmit acoustic energy, unlike electromagnetic waves which propagate freely through a vacuum. Radio waves and X-rays belong to the electromagnetic spectrum and do not need any medium. Wave mechanics and the distinction between mechanical and electromagnetic waves are staple physics topics in public service examinations.
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