a1c15 - Astronomy 1 I Last class: Detectors, space...

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Unformatted text preview: Astronomy 1 I Last class: Detectors, space astronomy. I Today: Relativity. I Albert Einstein quote of the day: “I was sitting in the patent office in Bern when all of a sudden a thought occurred to me: if a person falls freely, he won’t feel his own weight. I was startled. This simple thought made a deep impression on me. It impelled me toward a theory of gravitation.” — In Kyoto lecture, December 14, 1922. Special Relativity I Absolute reference frame: aether. Special Relativity I Absolute reference frame: aether. — light waves move at constant speed relative to the aether. Special Relativity I Absolute reference frame: aether. — light waves move at constant speed relative to the aether. I Michelson-Morely experiment (1887): Special Relativity I Absolute reference frame: aether. — light waves move at constant speed relative to the aether. I Michelson-Morely experiment (1887): — measure c in direction of Earth’s motion and opposite. Special Relativity I Absolute reference frame: aether. — light waves move at constant speed relative to the aether. I Michelson-Morely experiment (1887): — measure c in direction of Earth’s motion and opposite. — speed of light should be different, when moving in different directions. Special Relativity I Absolute reference frame: aether. — light waves move at constant speed relative to the aether. I Michelson-Morely experiment (1887): — measure c in direction of Earth’s motion and opposite. — speed of light should be different, when moving in different directions. ⇒ result: speed of light the same in all directions! Special Relativity I Basis for Einstein’s theory of special relativity: Special Relativity I Basis for Einstein’s theory of special relativity: — Laws of Physics are the same in all reference frames. Special Relativity I Basis for Einstein’s theory of special relativity: — Laws of Physics are the same in all reference frames. — Speed of light is the same for everyone. Special Relativity I Thought experiment — Dirty Harry and Captain Kirk: Special Relativity I Thought experiment — Dirty Harry and Captain Kirk: — Dirty Harry in a car travelling at 100 mi/h. Special Relativity I Thought experiment — Dirty Harry and Captain Kirk: — Dirty Harry in a car travelling at 100 mi/h. — fires a bullet at 700 mi/h. Special Relativity I Thought experiment — Dirty Harry and Captain Kirk: — Dirty Harry in a car travelling at 100 mi/h. — fires a bullet at 700 mi/h. — hits stationary target at 800 mi/h. Special Relativity I Thought experiment — Dirty Harry and Captain Kirk: — Dirty Harry in a car travelling at 100 mi/h. — fires a bullet at 700 mi/h. — hits stationary target at 800 mi/h....
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This test prep was uploaded on 04/17/2008 for the course SCI 1054 taught by Professor Wormer during the Spring '08 term at UCLA.

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a1c15 - Astronomy 1 I Last class: Detectors, space...

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