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# wave number

noun
1.
the number of waves in one centimeter of light in a given wavelength; the reciprocal of the wavelength.
Origin
1900-1905
1900-05
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for wave-number

## wave number

noun
1.
(physics) the reciprocal of the wavelength of a wave ν, σ
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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wave-number in Science
 wave number   The number of wave cycles per unit distance for a wave of a given wavelength.
The American Heritage® Science Dictionary
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Encyclopedia Article for wave-number

## wave number

a unit of frequency in atomic, molecular, and nuclear spectroscopy equal to the true frequency divided by the speed of light and thus equal to the number of waves in a unit distance. The frequency, symbolized by the Greek letter nu (nu), of any wave equals the speed of light, c, divided by the wavelength lambda: thus nu = c/lambda. A typical spectral line in the visible region of the spectrum has a wavelength of 5.8 10-5 cm; this wavelength corresponds to a frequency (nu) of 5.17 1014 Hz (hertz equals one cycle per second) obtained from the equation. Because this frequency and others like it are so extremely large, it is convenient to divide the number by the speed of light and hence reduce its size. Frequency divided by the speed of light is nu/c, which from the above equation is 1/lambda. When wavelength is measured in metres, 1/lambda represents the number of waves of the wave train to be found in a length of one metre or, if measured in centimetres, the number in one centimetre. This number is called the wave number of the spectrum line. Wave numbers are usually measured in units of reciprocal metres (1/m, or m-1) and reciprocal centimetres (1/cm, or cm-1).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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### Word Value for wave

10
11
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