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 modern, meaning, physical and/or sciences:
“Amplification is the vice of modern oratory. It is an insult to an assembly of reasonable men, disgusting and revolting instead of persuading. Speeches measured by the hour, die by the hour.”
—Thomas Jefferson (1743–1826)
“A route differs from a road not only because it is solely intended for vehicles, but also because it is merely a line that connects one point with another. A route has no meaning in itself; its meaning derives entirely from the two points that it connects. A road is a tribute to space. Every stretch of road has meaning in itself and invites us to stop. A route is the triumphant devaluation of space, which thanks to it has been reduced to a mere obstacle to human movement and a waste of time.”
—Milan Kundera (b. 1929)
“A woman may very well form a friendship with a man, but for this to endure, it must be assisted by a little physical antipathy.”
—Friedrich Nietzsche (1844–1900)
“I am not able to instruct you. I can only tell that I have chosen wrong. I have passed my time in study without experience; in the attainment of sciences which can, for the most part, be but remotely useful to mankind. I have purchased knowledge at the expense of all the common comforts of life: I have missed the endearing elegance of female friendship, and the happy commerce of domestic tenderness.”
—Samuel Johnson (1709–1784)