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ultrasonic    音标拼音: [,ʌltrəs'ɑnɪk]

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  • Ultrasound - Wikipedia
    Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz Ultrasound is used in many different fields Ultrasonic devices are used to detect objects and measure distances Ultrasound imaging or sonography is often used in medicine
  • Ultrasonics | Physics, Sound Waves Applications | Britannica
    An ultrasonic transducer is a device used to convert some other type of energy into an ultrasonic vibration There are several basic types, classified by the energy source and by the medium into which the waves are being generated
  • Do Ultrasonic Pest Repellers Work? – Forbes Home
    Wondering if ultrasonic pest repellers really work? Our article breaks down how effective they are and whether or not they’re worth purchasing for pest control
  • What Are Ultrasonic Waves and How Do They Work?
    Ultrasonic waves consist of sound energy that is too high-pitched for us to perceive This inaudible energy is now a powerful tool used across medicine, industry, and daily life, allowing us to see inside the human body or test the structural integrity of a bridge
  • Basic Principles of Ultrasound – Ultrasound Physics and its . . . - PALNI
    Define ultrasound and describe its characteristics as a form of energy Explain the principles of sound wave propagation, including frequency, wavelength, amplitude, and velocity Describe the piezoelectric effect and how it is used in ultrasound transducers
  • Do Ultrasonic Pest Repellers Work? - This Old House
    Do ultrasonic pest repellers actually work? Learn why results are inconsistent with these devices and which pest control methods are more effective for long-term results
  • Exploring Ultrasonic Waves: Properties and Uses
    Ultrasonic waves are sound waves with frequencies above the upper limit of human hearing, typically above 20 kHz These waves propagate through different media such as liquids, gases, and solids
  • How does ultrasound work? | Uses of ultrasound - Explain that Stuff
    Ultrasound waves have higher frequencies than normal sound waves, but they also have shorter wavelengths In other words, the distance between one ultrasound wave traveling through the air and the one following on behind it is much shorter than in a normal sound wave
  • Ultrasonic Sound - HyperPhysics
    The term "ultrasonic" applied to sound refers to anything above the frequencies of audible sound, and nominally includes anything over 20,000 Hz Frequencies used for medical diagnostic ultrasound scans extend to 10 MHz and beyond
  • ULTRASONIC Definition Meaning - Merriam-Webster
    Ultrasound, or ultrasonography, works on the principle that sound is reflected at different speeds by tissues or substances of different densities Ultrasound technology has been used medically since the 1940s





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