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:
“There is something terribly morbid in the modern sympathy with pain. One should sympathise with the colour, the beauty, the joy of life. The less said about life’s sores the better.”
—Oscar Wilde (1854–1900)
“Even in my own writings I cannot always recover the meaning of my former ideas; I know not what I meant to say, and often get into a regular heat, correcting and putting a new sense into it, having lost the first and better one. I do nothing but come and go. My judgement does not always forge straight ahead; it strays and wanders.”
—Michel de Montaigne (1533–1592)
“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)
“Criticism is a study by which men grow important and formidable at very small expense. The power of invention has been conferred by nature upon few, and the labour of learning those sciences which may, by mere labour, be obtained, is too great to be willingly endured; but every man can exert some judgment as he has upon the works of others; and he whom nature has made weak, and idleness keeps ignorant, may yet support his vanity by the name of critic.”
—Samuel Johnson (1709–1784)