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:
“I tell you, sir, the only safeguard of order and discipline in the modern world is a standardized worker with interchangeable parts. That would solve the entire problem of management.”
—Jean Giraudoux (1882–1944)
“Well may Mr. [David] Garrick be so celebrated, so universally admired—I had not any idea of so great a performer. Such ease! such vivacity in his manner! such grace in his motions! such fire and meaning in his eyes!—I could hardly believe he had studied a written part, for every word seemed uttered from the impulse of the moment. ... his voice—so clear, so melodious, yet so wonderfully various in its tones!”
—Frances Burney (1752–1840)
“There is nothing that man fears more than the touch of the unknown. He wants to see what is reaching towards him, and to be able to recognize or at least classify it. Man always tends to avoid physical contact with anything strange.”
—Elias Canetti (b. 1905)
“All the sciences are now under an obligation to prepare for the future task of philosopher, which is to solve the problem of value, to determine the rank order of values.”
—Friedrich Nietzsche (1844–1900)