when materialsabsorblight, the energy transforms to _____ energy.

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Absorption oflightin photosynthesis

The foundations of a quantum mechanical theory of light and its interactions with matter were developed in the late 1920s and ’30s by Paul Dirac, Werner Heisenberg, Pascual Jordan, Wolfgang Pauli, and others. The fully developed theory, called quantum electrodynamics (QED), is credited to the independent work of Richard Feynman, Julian S. Schwinger, and Tomonaga Shin’ichirō. QED describes the interactions of electromagnetic radiation with charged particles and the interactions of charged particles with one another. The electric and magnetic fields described in Maxwell’s equations are quantized, and photons appear as excitations of those quantized fields. In QED, photons serve as carriers of electric and magnetic forces. For example, two identical charged particles electrically repel one another because they are exchanging what are called virtual photons. (Virtual photons cannot be directly detected; their existence violates the conservation laws of energy and momentum.) Photons can also be freely emitted by charged particles, in which case they are detectable as light. Though the mathematical complexities of QED are formidable, it is a highly successful theory that has now withstood decades of precise experimental tests. It is considered the prototype field theory in physics; great efforts have gone into adapting its core concepts and calculational approaches to the description of other fundamental forces in nature (see unified field theory).

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Transmission oflightexamples

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The absorption of a photon by an atom is also a probabilistic event, with the probability per unit time being proportional to the intensity of the light falling on the atom. In 1917 Einstein, though not knowing the exact mechanisms for the emission and absorption of photons, showed through thermodynamic arguments that there must be a third type of radiative transition in an atom—stimulated emission. In stimulated emission the presence of photons with an appropriate energy triggers an atom in an excited state to emit a photon of identical energy and to make a transition to a lower state. As with absorption, the probability of stimulated emission is proportional to the intensity of the light bathing the atom. Einstein mathematically expressed the statistical nature of the three possible radiative transition routes (spontaneous emission, stimulated emission, and absorption) with the so-called Einstein coefficients and quantified the relations between the three processes. One of the early successes of quantum mechanics was the correct prediction of the numerical values of the Einstein coefficients for the hydrogen atom.

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What substance absorbslightenergy during photosynthesis

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Transmission oflight

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Einstein’s description of the stimulated emission process showed that the emitted photon is identical in every respect to the stimulating photons, having the same energy and polarization, traveling in the same direction, and being in phase with those photons. Some 40 years after Einstein’s work, the laser was invented, a device that is directly based on the stimulated emission process. (The acronym laser stands for “light amplification by stimulated emission of radiation.”) Laser light, because of the underlying properties of stimulated emission, is highly monochromatic, directional, and coherent. Many modern spectroscopic techniques for probing atomic and molecular structure and dynamics, as well as innumerable technological applications, take advantage of these properties of laser light.

When an isolated atom is excited into a high-energy state, it generally remains in the excited state for a short time before emitting a photon and making a transition to a lower energy state. This fundamental process is called spontaneous emission. The emission of a photon is a probabilistic event; that is, the likelihood of its occurrence is described by a probability per unit time. For many excited states of atoms, the average time before the spontaneous emission of a photon is on the order of 10−9 to 10−8 second.

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That materials, when heated in flames or put in electrical discharges, emit light at well-defined and characteristic frequencies was known by the mid-19th century. The study of the emission and absorption spectra of atoms was crucial to the development of a successful theory of atomic structure. Attempts to describe the origin of the emission and absorption lines (i.e., the frequencies of emission and absorption) of even the simplest atom, hydrogen, in the framework of classical mechanics and electromagnetism failed miserably. Then, in 1913, Danish physicist Niels Bohr proposed a model for the hydrogen atom that succeeded in explaining the regularities of its spectrum. In what is known as the Bohr atomic model, the orbiting electrons in an atom are found in only certain allowed “stationary states” with well-defined energies. An atom can absorb or emit one photon when an electron makes a transition from one stationary state, or energy level, to another. Conservation of energy determines the energy of the photon and thus the frequency of the emitted or absorbed light. Though Bohr’s model was superseded by quantum mechanics, it still offers a useful, though simplistic, picture of atomic transitions.

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Absorption oflightExamples

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What does it mean toabsorb light

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QED provides a theoretical framework for processes involving the transformations of matter into photons and photons into matter. In pair creation, a photon interacting with an atomic nucleus (to conserve momentum) disappears, and its energy is converted into an electron and a positron (a particle-antiparticle pair). In pair annihilation, an electron-positron pair disappears, and two high-energy photons are created. These processes are of central importance in cosmology—once again demonstrating that light is a primary component of the physical universe.