Ultrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or less.
Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy young adults. Ultrasound 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. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. Animals such as bats and porpoises use ultrasound for locating prey and obstacles.[1] Scientists are also studying ultrasound using graphene diaphragms as a method of communication.[
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2. Given a sag vertical curve connecting a -1.5% grade with a +2.5% grade on a rural arterial highway, use the rate of vertical curvature and a design speed of 70 mi/h to compute the elevation of the curve at 100 ft stations if the grades intersect at station (475+00) at an elevation of 300.00 ft. Identify the station and elevation of the low point.
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Question: An existing tunnel needs to be connected to a newly constructed bridge with sag and crest vertical curves. The sag curve begins at station 0+00 and elevation 100 ft. and the crest curve ends at station 12+00 and elevation 140 ft. Station 12 +00, PVT Bridge deck elevation 140 ft Tunnel floor elevation 100 ft WURUK Station 0 + 00, PVC, Develop a vertical alignment to connect the tunnel and bridge by determining the highest possible common design speed...
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2) What is the meaning of the expression EF = 0? 3) What is the difference between speed, velocity, and instantaneous velocity, velocity and acceleration? Give examples of each. 4) What are scalars and vectors. Explain them with examples. h (United States 0 Focus MACBOOK
Give the major product of the following sequence of reactions: 1) HNO3/H2SO4 acetophenone 2) H/Pd Op-aminoethylbenzene O m-aminoethylbenzene Om-nitroacetophenone O m-aminoacetophenone
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