Q. Which frequency range characterizes Ultrasound, that is beyond the upper limit of human auditory perception?
Answer: Above 20 KHz
Notes: Ultrasound corresponds to sound waves with frequencies exceeding the upper limit of human perceptible sound, generally above 20 kHz. Humans, typically, can perceive sounds ranging between 20 Hz and 20 kHz. Ultrasound, therefore, is beyond the auditory range of humans and is employed in technologies like medical imaging and sonar devices due to its unique properties.