Modern Meaning in The Physical Sciences
In the 17th century the word spectrum was introduced into optics, referring to the range of colors observed when white light was dispersed through a prism. Soon the term referred to a plot of light intensity or power as a function of frequency or wavelength, also known as a spectral density.
The term spectrum was expanded to apply to other waves, such as sound waves that could also be measured as a function of frequency. The term now applies to any signal that can be measured or decomposed along a continuous variable such as energy in electron spectroscopy or mass to charge ratio in mass spectrometry. Spectrum is also used to refer to a graphical representation of the as a function of the dependent variable.
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Famous quotes containing the words physical sciences, modern, meaning, physical and/or sciences:
“I hope I may claim in the present work to have made it probable that the laws of arithmetic are analytic judgments and consequently a priori. Arithmetic thus becomes simply a development of logic, and every proposition of arithmetic a law of logic, albeit a derivative one. To apply arithmetic in the physical sciences is to bring logic to bear on observed facts; calculation becomes deduction.”
—Gottlob Frege (1848–1925)
“There are moments when, faced with our lack of success, I wonder whether we are failures, proud but impotent. One thing reassures me as to our value: the boredom that afflicts us. It is the hall-mark of quality in modern men.”
—Edmond De Goncourt (1822–1896)
“Father, father! The chariots of Israel and its horsemen!”
—Bible: Hebrew, 2 Kings 2:12.
Elisha of Elijah, meaning he is more important than these.
“Patience, that blending of moral courage with physical timidity.”
—Thomas Hardy (1840–1928)
“Indubitably, Magick is one of the subtlest and most difficult of the sciences and arts. There is more opportunity for errors of comprehension, judgement and practice than in any other branch of physics.”
—Aleister Crowley (1875–1947)