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Ultrasound. An ultrasonic examination. Ultrasound is sound with frequencies greater than 20 kilohertz. [1] This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from ...
Mexico,[a][b] officially the United Mexican States,[c] is a country in the southern portion of North America. It covers 1,972,550 km2 (761,610 sq mi),[11] making it the world's 13th-largest country by area; with a population of almost 130 million, it is the 10th-most-populous country and the most populous Spanish-speaking country.[12] Mexico ...
