Another of his important achievements was his atlas of the normal solar spectrum, published in , which became a standard reference tool. He remained at the University of Uppsala until his death on June 21, The unit of measure for the wavelength of light, officially adopted in , is called the angstrom in his honor. Signified by A and equal to one hundred millionth of a centimeter 10 -8 cm , the angstrom serves as a convenient unit that can be used to specify radiation wavelengths, which enables physicists to avoid writing large numbers of zeroes, when discussing the wavelength of light.
Next post: Bernoulli, Daniel physicist. All materials conduct heat differently, and it was Anders Angstrom who developed a method for measuring thermal conductivity. In the course of his studies he found that it was proportional to electrical conductivity.
One of his revolutionary insights came through the observation of electric sparks. He found that when he analyzed the spectrum of the light emitted from an electric spark, there were actually two different spectra superimposed on one another. One of the spectra was specific to the material from whence the spark originated whether that be some form of metal or electrode while the other spectral line or emitted spectral line was the result of the gas that the light from the spark passed through.
As light passes through a gas, that gas will absorb specific frequencies within light which differ depending on the type of atom s the gas is made up of which will then not be measured in the spectrum by the observer, even if it was in the initial light signal. This realization had profound implications in astronomy and astrophysics, because it enables us to determine the composition of stars from light-years away, as well as determine the content of the Interstellar Medium, for example.
Both of these ideas were revolutionary, though they were overlooked for more than a decade. It was in , two years before his death, that the scientific community caught on to his discovery. After a few years working there, he returned to Uppsala in and received the professorship of Physics in He focused his research work on investigating the radiation of heat from the sun, terrestrial nocturnal emission and its absorption by the Earth's atmosphere, and to that end devised various delicate methods and instruments, including his electric compensation pyrheliometer, invented in , apparatus for obtaining a photographic representation of the infra-red spectrum and pyrgeometer abt.
In , Herr J. This result, in addition to the observation made a couple of years before that the superposition of the water vapour absorption bands, more abundant in the atmosphere, over those of CO2, convinced some geologists for a time that calculations by Svante Arrhenius for CO2 warming were wrong; though subsequent work in following decades eventually vindicated Arrhenius.
The experiment, however, was careless seen from the current perspective with erroneous result but of a historical significance in the development of the theory of the greenhouse effect amplified by CO2. He was elected a member of the Royal Swedish Academy of Sciences in Pantheon has 14 people classified as physicists born between and Of these 14, 1 7.
The most famous living physicists include Max Tegmark. As of October , 1 new physicists have been added to Pantheon including Bert Bolin. Web Resources. Java Microscopy. Win Wallpaper. Mac Wallpaper. Custom Photos. Image Use. Contact Us.
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