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applications of ultrasonic waves

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From Yahoo Answers

Question:......at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.) Can somebody show me the setup? Thanks.

Answers:The wave equation c = x f hold also for the sound, where c is the speed of sound, f is the frequency and is the wavelength. So, = c / f = 340 m/s / 20,000 /s = 0.017 m = 17 mm.

Question:what do they detect and how? how come they can still detect you in the boot of a car?

Answers:They consist of a transmitter (loudspeaker) and a receiver (microphone) The ultrasonic range is used so the constant noise doesn't annoy people (I have no idea what it might do for dogs and bats!) the transmitter sets up a very stable standing wave of high frequency sound which is picked up by the receiver. If anything gets between these two devices, the frequency changes a bit. This change is detected by the receiver and the alarm triggered. It can be very sensitive and so will detect movement in the boot but not all are as good as that and only work in the passenger compartment.

Question:What is the wavelength of a 340-Hz tone in air? What is the wavelength of a 34,000-Hz ultrasonic wave in air? Help please. Thanks so much!

Answers:340 Hz = 1 meter 34,000 Hz = 1 millimeter

Question:i did the tuning fork math experiment where you get the vibrations of a tuning fork on your calculator, and i need to relate the lab to a concept or application of mathatics in the real world

Answers:The obvious application is using a tuning fork to tune an instrument to a particular note/key.

From Youtube

Ultrasonic Application Equipment :Principles: With our ultrasonic application equipement you can learn ultrasonic analytics starting from the basics of ultrasounds up to their use in numerous applications. What you can learn about analytical applications of ultrasound: a) 2 different measuring techniques: echoscopy, Doppler sonography b) manuel measurement: measurement by automatical scanning, tomography c) different fields of applications: medicin, material sciences, metallurgy, biophysics, hydraulics, fluid mechanics, flow dynamics, Features and benefits: The equipement covers all important techniques of ultrasonic analytics: * echoscopy * Doppler sonography * A-scan * B-scan * Time-motion mode * TOFD * Tomography * mechanical scanner * modular concept consisting of basic sets and application oriented extension sets * experiments starting from the basics of ultrasounds up to numerous applications * detailled experimental literature * easy to handle software

Ultrasonic Shear Wave Imaging :Marko Orescanin, MS and Michael F. Insana, Ph.D. Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign. The video illustrates the principles behind ultrasonic shear wave imaging. It is the result of a simulation on a super computer of sound waves being generated in a tissue-like medium. While some labs use similar techniques for diagnostic imaging, our lab is developing these methods for mechano-biology investigations of cancer in 3-D cell cultures. Video Part 1: A linear array transducer (top) transmits a high-intensity beam of sound (blue lines). The transmitted sound pulse applies a radiation force at the focal length that briefly displaces the medium downward. This medium is a collagen gel that contains a sphere of cancer cells (red). The first response of the medium to the force is for fast pressure waves to emerge vertically traveling upwards and downwards. We ignore the fast pressure waves. Of greater interest are the slow shear waves that emerge later and travel laterally toward (and away from) the red sphere of cancer cells. Low-intensity Doppler pulses (blue lines) are transmitted throughout the volume by the same linear array to detect the shear waves. Notice that when shear waves enter the red sphere, they become distorted, racing ahead, because their speed of propagation is faster in the sphere than outside of the sphere. Measuring the shear wave speed, we can create images of stiffness (shear modulus) and viscosity ...