Скачать или смотреть How Did We Discover the Speed of Light? | History of Experiments

How Did We Discover the Speed of Light? | History of Experiments

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Описание к видео How Did We Discover the Speed of Light? | History of Experiments

How did humans discover the speed of light? From Galileo’s lanterns to Rømer, Fizeau, and Foucault — history reveals the answer.

For centuries, people thought light was instant. Galileo tried timing lantern flashes but failed because light was too fast for human reaction. In 1676, Ole Rømer studied Jupiter’s moon Io and proved light takes time to travel. Using his data, Christiaan Huygens made the first calculation. Later, Hippolyte Fizeau used a spinning toothed wheel, and Léon Foucault refined it with a rotating mirror — bringing us closer to the exact speed.

Today, with lasers and atomic clocks, we know the precise value: 299,792 kilometers per second in a vacuum — the fastest thing in the universe.

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