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5 ώρες πριν · Air is thin enough that in the Earth's atmosphere radio waves travel very close to the speed of light. The wavelength is the distance from one peak (crest) of the wave's electric field to the next, and is inversely proportional to the frequency of the wave. The relation of frequency and wavelength in a radio wave traveling in vacuum or air is.
1 ημέρα πριν · Medical ultrasound includes diagnostic techniques (mainly imaging techniques) using ultrasound, as well as therapeutic applications of ultrasound. In diagnosis, it is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs, to measure some characteristics (e.g. distances and velocities) or to generate an informative audible sound.
5 ώρες πριν · The United States Army ( USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution. [15] The Army is the oldest branch of the U.S. military and the most senior in order of precedence. [16]
1 ημέρα πριν · Russia is planning to slow YouTube speeds on desktop computers in the country by up to 70% in a bid to penalise the video-sharing site, a senior politician has said.
