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Ava_Seven
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who was the first person to discover how to measure the wavelength of
absorption lines in the solar or stellar spectra and what method was used?
absorption lines in the solar or stellar spectra and what method was used?
Simon Bridge said:Have you tried entering "discovery of solar absorbtion lines" into google?
https://en.wikipedia.org/wiki/Fraunhofer_lines
Ava_Seven said:I understand that Fraunhofer's measured wavelengths of spectral lines and that he had scribed a diffraction granting with 50000 grooves per inch and had used it for that purpose, getting results for the sodium doublet close to modern values. Regarding his procedure, was he the first or was it Augusti Fresnel or someone else?
Yes I did read the link. No need to be rude. This is a debate/discussion in one of my classes, and the question is generate thought beyond Wiki. Just because Wiki doesn't mention it, doesn't mean those people mentioned didn't do what was said.davenn said:did you actually read the Wiki link given to you ?
it answered your Q
there is no mention of Augusti Fresnel being involved with emission/absorption lines discovery either in that link or in the wiki entry for Augusti Fresnel
D
Ava_Seven said:Yes I did read the link. No need to be rude.
This is vital information you left out.Ava_Seven said:Yes I did read the link. No need to be rude. This is a debate/discussion in one of my classes, and the question is generate thought beyond Wiki. Just because Wiki doesn't mention it, doesn't mean those people mentioned didn't do what was said.
Johannas Fraunhoferwho was the first person to discover how to measure the wavelength of
absorption lines in the solar or stellar spectra...
diffraction spectroscopy.. and what method was used?
Fraunhofer was first. Since you read the link, you ready the bit right at the start that said:I understand that Fraunhofer's measured wavelengths of spectral lines and that he had scribed a diffraction granting with 50000 grooves per inch and had used it for that purpose, getting results for the sodium doublet close to modern values. Regarding his procedure, was he the first or was it Augusti Fresnel or someone else?
The inch.And what unit did they use?
Also inches ... Young developed the technique of diffraction spectroscopy used by Fresnel and others ... Fresnel has nothing to do with the question in post #1.In 1801 Thomas Young used his experiments with double slits to measure wavelengths of the seven rainbow 'colours' described by Newton and got respectable results. Still don't know the units though.
Wavelength absorption lines are dark lines that appear in the spectrum of a star or other astronomical object. They are created when light from the object passes through a cooler gas, causing specific wavelengths of light to be absorbed by the gas atoms. This creates a pattern of dark lines in the spectrum, which can be used to identify the elements present in the gas and their relative abundances.
The discovery of how to measure wavelength absorption lines can be attributed to several scientists, including Fraunhofer, Kirchhoff, and Bunsen. In the early 19th century, Fraunhofer observed dark lines in the spectrum of the sun and hypothesized that they were caused by elements in the sun's atmosphere. Kirchhoff and Bunsen later developed the spectroscope, a tool used to study the spectrum of light, which allowed them to measure and identify the specific wavelengths of the absorption lines.
The ability to measure wavelength absorption lines has had a profound impact on the field of astronomy. It has allowed scientists to identify the chemical composition of stars and other astronomical objects, providing valuable insights into the formation and evolution of the universe. It has also been used to study the motion of stars and galaxies, as well as to identify the presence of exoplanets.
There are several techniques used to measure wavelength absorption lines, including spectroscopy, interferometry, and Doppler imaging. Spectroscopy involves analyzing the spectrum of light from an object and measuring the specific wavelengths and intensities of the absorption lines. Interferometry uses the interference of light waves to measure the physical properties of an object, such as its size and shape. Doppler imaging uses the Doppler effect to measure the motion of an object, which can be used to study the presence of absorption lines.
Advancements in technology have greatly improved the measurement of wavelength absorption lines. The development of more precise spectrometers and telescopes has allowed for more accurate and detailed measurements of the absorption lines. Techniques such as adaptive optics and interferometry have also improved our ability to study the spectra of distant objects. Additionally, the use of computer algorithms and data analysis techniques has made it possible to quickly and accurately analyze large amounts of spectral data.