Ultrasonic waves are sound waves that have a frequency higher than what humans can hear, typically above 20,000 hertz. These waves are used in various applications, such as medical imaging and cleaning delicate objects. For example, in ultrasound technology, doctors use ultrasonic waves to create images of the inside of the body, helping them diagnose conditions without invasive procedures. In addition to medical uses, ultrasonic waves are also employed in industrial cleaning and pest control. Ultrasonic cleaners use these waves to remove dirt and grime from items like jewelry and electronic parts. Similarly, some devices emit ultrasonic waves to deter pests, making them a useful tool in both homes and gardens.