This scientist's work "Optical investigations" contains his principle of spectrum analysis, demonstrating that a hot gas emits light at the same frequency as it absorbs it when it is cooled.
This scientist's work "Optical investigations" contains his principle of spectrum analysis, demonstrating that a hot gas emits light at the same frequency as it absorbs it when it is cooled. The first person to study the spectrum of the aurora borealis, he identified the presence of hydrogen in the Sun, and his 1868 work "Researches of the Solar Spectrum" presented an atlas of the solar spectrum with measurements of 1,000 spectral lines expressed in units of one ten-millionth of a millimeter. FTP, who was this Swedish astrophysicist whose name is now used to represent the unit of measure he used?
This scientist's work "Optical investigations" contains his principle of spectrum analysis, demonstrating that a hot gas emits light at the same frequency as it absorbs it when it is cooled.
Anders Jonas Angstrom