Multiple choice physics medical imaging ultrasonic sound using ultrasound in medicine ultrasound and its applications Mark the correct statement: Human beings cannot hear ultrasound. Dogs, bats and dolphins can hear ultrasound. Ultrasound have short wavelength. All Reveal answer Fill a bubble to check yourself D Correct answer Explanation The sound waves having frequency higher than 20,000 Hz iscalled ultrasonic waves. Human beings can"t hear Ultra sound. Bats and dolphins detect the presence of any obstacle byhearing the echo of the sound produced by them.