Question Detail
Question
Ultrasonic waves produced by a vibrating quartz crystal are
Correct Answer
Option A is the correct answer.
Detailed Explanation
Ultrasonic waves in a medium (like air or water) are longitudinal waves, where the particle displacement is parallel to the direction of wave propagation. In a solid crystal, quartz can produce both longitudinal and transverse ultrasonic waves depending on the cut, but the question likely refers to ultrasonic waves in general, which are longitudinal.
Hint
Ultrasonic waves are sound waves, which are longitudinal.