High-frequency sound waves that humans can't hear are often referred to as ultrasonic waves. Ultrasonic waves have frequencies above the upper limit of human hearing, which is typically considered to be around 20,000 Hz (20 kHz).
To determine if something produces ultrasonic waves, specialized equipment is required. Ultrasonic detectors or sensors are designed to detect and measure ultrasonic frequencies. These devices are equipped with sensitive transducers that can pick up ultrasonic vibrations and convert them into audible signals or visual displays.
These detectors can be used in various applications, such as industrial testing, medical imaging, non-destructive testing, pest control, and even animal communication studies. They are capable of detecting ultrasonic waves emitted by objects or organisms and provide evidence of their presence.
Additionally, some animals, such as dogs, bats, and dolphins, have the ability to hear or emit ultrasonic frequencies naturally. They rely on these high-frequency sounds for communication, navigation, and prey detection. Observing the behavior of these animals and their responses to specific stimuli can also indicate the presence of ultrasonic waves.