Photometric standards for lighting systems - intensity of light units
Waterabsorptioncoefficient
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Four scenarios involving absorption of light and electron jumps are shown. This graph is almost identical to the diagram of the hydrogen atom on the left side of the infographic, but does not show the nucleus of the atom. The energy levels are represented by straight horizontal lines instead of concentric circles. As in the atom diagram, the electron is represented as a small circle. Light is represented as a wavy colored arrow. The change in energy level is shown with a dashed, straight gray arrow.
The three graphics on the right side of the infographic are aligned to show the relationship between the color of light absorbed and the electron jumps, the absorption lines in the picture of the spectrum, and the absorption valleys on the graph.
A diagram of a hydrogen atom shows the relationship between the color of light absorbed by an electron and its change in energy level.
Visiblelightwavelength
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This four-part infographic titled “Absorption of Light by Hydrogen” illustrates the relationship between the wavelength of light absorbed by an electron in a hydrogen atom, the change in energy level of the electron, a picture of the absorption lines in the hydrogen spectrum, and the graph of hydrogen’s absorption spectrum. The graphic includes:
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The spectrum is graphed as a line. The overall shape of the line resembles a bell curve cut off on the left and right sides. The curve begins on the far left with a brightness of about 0.83, increases to a peak of 1 at about 500 nanometers, and then decreases gradually to a low of about 0.7 on the right side of the graph.
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Four scenarios involving absorption of light and electron jumps are shown. In all four cases, the electron is represented as a small circle. Light is represented as a wavy colored arrow. The change in energy level is shown with a dashed, straight white arrow. In all four scenarios, the small circle is positioned on energy level 2 to indicate the electron’s starting energy level.
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Superimposed on the curve are absorption features: four steep valleys of relatively low brightness. From left to right, the valleys appear at wavelengths of 410 nanometers, 434 nanometers, 486 nanometers, and 656 nanometers. The depths of the valleys increase from left to right.
At the center is a solid circle representing hydrogen’s nucleus. Six concentric circles representing electron energy levels (or orbitals) surround the nucleus. The circles are labeled “level 1” through “level 6” with level 1 closest to the nucleus, and level 6 farthest. The distance between adjacent energy levels decreases with distance from the nucleus.
Directly below this graph is an illustration of a hydrogen absorption spectrum. The spectrum is a rectangle with rainbow coloring: purple on the left to red on the right. The rainbow pattern is not continuous and includes four black lines of varying width.
Absorptionspectra
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The relationship between a hydrogen atom and its absorption spectrum. (Left) A simple model of a hydrogen atom showing four of the many possible “jumps” the electron could make when it absorbs light. (Right) The relationship between the electron jumps and the specific wavelengths of light that the atom absorbs. An electron jumps from one energy level to another only when it absorbs a very specific wavelength of light (i.e., when it absorbs a photon with a specific energy). The shorter the wavelength, the higher the energy, and the greater the jump. Wavelengths that are absorbed appear as black lines in the spectrum. This illustration shows a set of jumps that correspond to absorption of visible wavelengths (the Balmer Series).
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At the bottom, directly below the picture of the spectrum is a graph of the same spectrum. The vertical y-axis is labeled “Brightness.” The horizontal x-axis is labeled “Wavelength (nanometers)” and ranges from about 375 nanometers at the origin on the far left, to about 775 nanometers on the far right. The axis is labeled in even increments of 100 nanometers, starting at 400 nanometers.
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