An ultrasound is an exam during which high - frequency sound waves produce an image of your developing fetus. (verywellfamily.com)
To obtain graphene, the researchers exposed its parent compound, graphite, to a high frequency sound wave. (sciencedaily.com)
Ultrasound therapy passes high frequency sound waves into the tissues providing a micro massage and pain killing effect, also relieving spasm in the muscles. (sportsinjuryclinic.net)