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4 天前 · Colour - Visible Spectrum, Wavelengths, Hues: Newton demonstrated that colour is a quality of light. To understand colour, therefore, it is necessary to know something about light. As a form of electromagnetic radiation, light has properties in common with both waves and particles. It can be thought of as a stream of minute energy ...
- Kurt Nassau
2024年7月22日 · Roman numeral, any of the symbols used in a system of numerical notation based on the ancient Roman system. The symbols are I, V, X, L, C, D, and M, standing respectively for 1, 5, 10, 50, 100, 500, and 1,000 in the Hindu-Arabic numeral system.
- The Editors of Encyclopaedia Britannica
2024年8月21日 · Light - Electromagnetic, Wavelength, Spectrum: In spite of theoretical and experimental advances in the first half of the 19th century that established the wave properties of light, the nature of light was not yet revealed—the identity of the wave oscillations remained a mystery. This situation dramatically changed in the 1860s when the Scottish physicist James Clerk Maxwell, in a watershed ...
2024年8月25日 · Microscope, instrument that produces enlarged images of small objects, allowing the observer an exceedingly close view of minute structures at a scale convenient for examination and analysis. It may provide a dynamic image (as with optical instruments) or one that is static (as with scanning electron microscopes).
2024年8月21日 · Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. The law of reflection states that, on reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray.
Jupiter is the largest planet in the solar system and has, as of 2023, 95 known moons. The four largest moons of Jupiter—Io, Callisto, Ganymede, and Europa—were the first objects in the solar system discovered with a telescope. Galileo discovered them in 1610, and they are now called the Galilean.
2024年7月23日 · Epistemology, the philosophical study of the nature, origin, and limits of human knowledge. The term is derived from the Greek episteme (“knowledge”) and logos (“reason”). Along with metaphysics, logic, and ethics, it is one of the four main branches of philosophy.
