GEO 2021Q65
Q: Which one of the following statements with regard to ultrasonic waves is NOT correct?
(a)Ultrasonic waves have frequency above 20 kHz
(b)Ultrasonic waves are longitudinal waves
(c)Ultrasonic waves can travel through water
(d)Ultrasonic waves can travel through vacuum
Correct Answer: (d)
Detailed explanation coming soon.