# wave number

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## wave number

[′wāv ‚nəm·bər] (physics)

The reciprocal of the wavelength of a wave, or sometimes 2π divided by the wavelength. Also known as reciprocal wavelength.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

The following article is from

*The Great Soviet Encyclopedia*(1979). It might be outdated or ideologically biased.## Wave Number

a quantity related to the wavelength λ by the ratio *k = 2π/λ* (the number of waves in a length of 2 π). In spectroscopy the reciprocal of the wavelength (I/λ.) is often called the wave number.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

## wave number

The reciprocal of a wavelength (i.e., 1/λ or 2/λ, where λ is the wavelength).

An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved