A Treatise On Light
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In our eReader you can find the full English version of the book. Read A Treatise On Light Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Treatise On Light
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It seemed natural to expect that the different lines in a spectrum might be caused by the different modes of vibration of the same system, and thus arose a search for a mathematical relation between their wave-lengths.
At first investigators were misled by the acoustical analogue and sought to show that the frequencies were to one another as simple whole numbers. Schuster proved that these early results were merely chance coincidences, and progress was not made until the introduction of Rowland...'s gratings and the great increase in the accuracy of wave- length determination which they rendered possible. The first to achieve a decisive result was Balmer. In 1885 he showed that the wave-lengths of the first nine lines of the hydrogen spectrum can be represented by the formula where A is a constant and n an integer which varies from 3 to 11. The formula could not be verified further as there were no further measurements available then. Afterwards additional lines were dis- covered in the vacuum tube spectrum of hydrogen by Ames and also in the spectrum of solar protuberances and in the so-called flash spectrum by Evershed.
What to read after A Treatise On Light?
You can find similar books in the "Read Also" column, or choose other free books by Robert Alexander Houstoun to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It seemed natural to expect that the different lines in a spectrum might be caused by the different modes of vibration of the same system, and thus arose a search for a mathematical relation between their wave-lengths.
At first investigators were misled by the acoustical analogue and sought to show that the frequencies were to one another as simple whole numbers. Schuster proved that these early results were merely chance coincidences, and progress was not made until the introduction of Rowland...'s gratings and the great increase in the accuracy of wave- length determination which they rendered possible. The first to achieve a decisive result was Balmer. In 1885 he showed that the wave-lengths of the first nine lines of the hydrogen spectrum can be represented by the formula where A is a constant and n an integer which varies from 3 to 11. The formula could not be verified further as there were no further measurements available then. Afterwards additional lines were dis- covered in the vacuum tube spectrum of hydrogen by Ames and also in the spectrum of solar protuberances and in the so-called flash spectrum by Evershed.
What to read after A Treatise On Light?
You can find similar books in the "Read Also" column, or choose other free books by Robert Alexander Houstoun to read onlineMoreLess
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