Chapter 20 - Relativity - Davidson Physics

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Announcements Review The Twin Paradox Length Contraction Final QuestionsQuestionThe Twin ParadoxAn astronaut is chosen to embark on an epic mission while his identical twin stays at home. The astronaut’sjourney involves him traveling in an experimental fully-automated space ship at an astounding speed of 0.9999c toa distant star and then returning home. After blasting off, the astronaut measures the total time of the round tripto be one year. How much time has elapsed on Earth (and for the astronaut’s identical twin)?AnswerAbout 70 years<strong>Relativity</strong>
Announcements Review The Twin Paradox Length Contraction Final QuestionsA paradox?Clocks on a space ship run slower than clocks on EarthFrom the point of view (frame of reference) of the astronaut in the space ship,Earth is moving away from him, so clocks on Earth should run slower than clocks on the ship!It would seem that by symmetry, both the astronaut and his twin will observe the other as aging slower.Who is right?<strong>Relativity</strong>
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Chapter 20 - Relativity - Davidson Physics

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