What Is the Big Deal about Quantum Theory?Quantum theory is the theory that radiant energy is given off and absorbed in units, sort of like bullets from a gun, rather than a steady stream, like a water hose. It was originated by Max Planck, a German physicist, in 1900 through studies he made on radiant energy. Before his discovery, scientists thought that energy, like all other physical processes, was emitted and absorbed continuously. In 1905, Albert Einstein took it a step further and established quantum theory by showing that the energy of light is concentrated in particle-like quanta, rather than in a continuous wave. Today, physicists generally treat light as a wave in processes that involve its transmission, and as quanta, called photons, in processes involving emission or absorption. Quantum theory completely changed the study of physics and paved the way for discoveries about photo-electricity, photochemistry, and the structure and activities of atoms. Виберіть правильний варіант. 1. Quantum theory deals with ___. a) radiant energy b) nuclear energy c) kinetic energy 2. The author of this theory was ___. a) Mark Twain b) Max Planck c) Pierre Curie 3. Photons are quanta of ___. a) energy b) sound c) light
22.4. Граматика. Повторення модальних дієслів з перфектним інфінітивом
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