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... (A) The index of refraction is the same for the two media. (B) Light travels faster in medium 2 than in medium 1. (C) Snell's law breaks down at the interface. (D) Light would arrive at Y in less time by taking a straight line path from X to Y than it does taking the path shown above. (E) Light leav ...
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... electrons are emitted from the cathode and are accelerated toward the anode. Many of these electrons (aka cathode rays), miss the anode and strike instead the glass wall of the tube, causing it to exhibit ...
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Speed of gravity

In classical theories of gravitation, the speed of gravity is the speed at which changes in a gravitational field propagate. This is the speed at which a change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the gravitational field which it produces. In a more physically correct sense, the ""speed of gravity"" refers to the speed of a gravitational wave, which in turn is the same speed as the speed of light (c).
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