2. Ultrasonic ranging: Ultrasonic wave has strong directivity and is easy to reflect when encountering obstacles, so the ultrasonic locator can detect the position of submarines, schools of fish and the depth of the ocean.
3. Ultrasonic tooth cleaning: the high-frequency oscillation signal sent by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer, and then propagates into the medium, destroying insoluble dirt and dispersing it in the cleaning solution.
Extended information: The energy transmitted by ultrasonic waves is much greater than that of audible sound. Because when sound waves reach a substance, the molecules in the substance vibrate with it, and the frequency of vibration is the same as that of sound waves, so the molecular vibration frequency determines the speed of molecular vibration, and the higher the frequency, the greater the speed. Thus, the molecules of a substance get energy by vibration, and its energy is not only related to the mass of the molecule, but also proportional to the square of the vibration speed of the molecule, and the vibration speed is related to the frequency of the molecular vibration, so the higher the frequency of sound waves, that is, the higher the energy obtained by the molecules of the substance. The frequency of ultrasonic wave can be much higher than that of sound wave, so ultrasonic wave can make substance molecules gain more energy. This shows that ultrasound itself can supply enough energy to the substance.