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Third, sound is a vibration that travels through a medium, like a gas, a liquid or a solid object. A sound's source is an object that moves or changes shape very rapidly. For example, if you strike a bell, the bell vibrates in the air. As one side of the bell moves out, it pushes the air molecules next to it, increasing the pressure in that region of the air. This area of higher pressure is a compression. As the side of the bell moves back in, it pulls the molecules apart, creating a lower-pressure region called a rarefaction. The bell then repeats the process, creating a repeating series of compressions and rarefactions. Each repetition is one wavelength of the sound wave. The sound wave travels as the moving molecules push. Pull the molecules around them. Each molecule moves the one next to it in turn. Without this movement of molecules, the sound could not travel, which is why there is no sound in a vacuum.|Sure, salespeople will encourage you to buy the expensive cables. But do premium audio cables really make that much of a difference in sound quality? Back in the day -- like, the mid-1970s -- audio cables were known by the humbler name of "speaker wires," and nobody got too excited about them. A stereo store salesman might throw in a bale of the old twisted copper, plastic-encased stuff for free as a gesture of appreciation -- after he'd convinced you to blow your savings on a set of towering quadraphonic speakers. Being able to blast the latest Foghat or Aerosmith record at paint-peeling volume was what everyone cared about. Speaker wire, in contrast, was just boring. But that was then. Today, go to a big box store or peruse a home electronics Web site and you'll be informed that all that high-end digital audio equipment you're contemplating will sound like junk if you don't hook up the speakers with premium audio cable. Ukraine under Perestroika: Ecology, Economics and the Workers' Revolt. McElrath, Karen (ed.). HIV and AIDS: A Global View. McFaul, Michael. The Troubled Birth of Russian Democracy: Parties, Personalities, and Programs. Mesbahi, Mohiaddin (ed.). Russia and the Third World in the Post-Soviet Era. Mirchuk, I. (ed.) Ukraine and its People. The Modern Encyclopedia of Russian, Soviet and Eurasian History. Motyl, Alexander J. Dilemmas of Independence: Ukraine after Totalitarianism. Rudnytsky, Ivan L. (ed.). Essays in Modern Ukrainian History. Schulz-Torge, Ulrich-Joachim (ed.). Who's Who in Russia Today: A Biographical Dictionary of More than 2,100 Individuals from the Russian Federation Including the Other Fourteen USSR Republics. Sevcenko, Ihor. Byzantine Roots of Ukrainian Christianity. Shcherbitskii, V. V. Soviet Ukraine. Shen, Raphael. Ukraine's Economic Reform: Obstacles, Errors, Lessons . Shevchuk, H. M. Cultural Policy in the Ukrainian Soviet Socialist Republic. Solovev, Vladimir. Boris Yeltsin: A Political Biography. Steele, Jonathan. Eternal Russia: Yeltsin, Gorbachev and the Mirage of Democracy. Subtelny, Orest. Ukraine: A History . Toronto: University of Toronto Press, 1994. World Congress for Soviet. East European Studies. Ukrainian Past, Ukranian Present . Yeltsin, Boris Nikolayevich. The Struggle for Russia. coronavirus en estados unidos

















































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