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:
“The vanity of the sciences. Physical science will not console me for the ignorance of morality in the time of affliction. But the science of ethics will always console me for the ignorance of the physical sciences.”
—Blaise Pascal (1623–1662)
“Women have acquired equal place to man in society, but the double standard has really never been relinquished; certainly not by men. Modern man’s fear of passivity or of the active woman proves to be as eternal as modern woman’s struggle to come to terms with her femininity.”
—Peter Blos (20th century)
“Do you know what Agelisas said, when he was asked why the great city of Lacedomonie was not girded with walls? Because, pointing out the inhabitants and citizens of the city, so expert in military discipline and so strong and well armed: “Here,” he said, “are the walls of the city,” meaning that there is no wall but of bones, and that towns and cities can have no more secure nor stronger wall than the virtue of their citizens and inhabitants.”
—François Rabelais (1494–1553)
“How many young hearts have revealed the fact that what they had been trained to imagine the highest earthly felicity was but the beginning of care, disappointment, and sorrow, and often led to the extremity of mental and physical suffering.”
—Catherine E. Beecher (1800–1878)
“Normally, the sciences distance themselves from life and the return to it via a detour.”
—Johann Wolfgang Von Goethe (1749–1832)