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.
Read more about this topic: Spectrum
Famous quotes containing the words modern, meaning, physical and/or sciences:
“Insolent youth rides, now, in the whirlwind. For those modern iconoclasts who are without culture possess, apparently, all the courage.”
—Ellen Glasgow (1873–1945)
“Every generation rediscovers and re-evaluates the meaning of infancy and childhood.”
—Arnold Gesell (20th century)
“Patience, that blending of moral courage with physical timidity.”
—Thomas Hardy (1840–1928)
“Normally, the sciences distance themselves from life and the return to it via a detour.”
—Johann Wolfgang Von Goethe (1749–1832)