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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.|An extraordinary meeting of the UEFA executive committee will be held on Friday to discuss the geopolitical crisis and when officials are set to confirm taking the May 28 showpiece game out of Russia, a person with knowledge of the process said on Thursday. The person spoke on condition of anonymity to discuss private talks. UEFA confirmed there is a meeting due at 0900 GMT on Friday. “Following the evolution of the situation between Russia and Ukraine in the last 24 hours, the UEFA president has decided to call an extraordinary meeting of the executive committee … ” UEFA said in a statement. The British government and fan groups had been asking UEFA to no longer play the game in the St. Petersburg, where the stadium is sponsored by Russian state-owned energy giant Gazprom. “On this tragic day, our thoughts are with everyone in Ukraine, our friends, colleagues, members, & their loved ones,” the Fans Supporters Europe group tweeted Thursday. The Ukrainian Premier League suspended operations on Thursday due to President Volodymyr Zelenskyy’s decision to impose martial law. The league has been on a two-month winter break. Was due to resume on Friday. It did not give any planned date to restart. The International Paralympic Committee said it was in talks with sports officials in Ukraine. Russia as their teams prepare to head to China for the start of the Paralympic Games next week. “The IPC is in dialogue with both the Ukrainian and Russian Paralympic Committees ahead of the Beijing 2022 Paralympic Winter Games,” the IPC said in an emailed statement. Russia’s name, flag and anthem are already barred from the March 4-13 Paralympics in Beijing over previous doping disputes. Its team is due to compete as RPC, short for Russian Paralympic Committee.




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