Q. Ultrasonic waves are those waves
A) To which man can hear
B) Man can’t hear
C) Are of high velocity
D) Of high amplitude
Explanation
(b) Ultrasonic waves are those of higher frequencies than maximum audible range frequencies (audible range of frequencies is $20\ Hz$ to $20000\ Hz$)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.