An Etymological Dictionary of Astronomy and Astrophysics

Deriving the → wavelength of an undulatory phenomenon from its → frequency, and vice versa.

1. For → electromagnetic waves: λ = c / f, where λ is the wavelength, c is the → speed of light in → meters per second
   and f the frequency in → hertz. It can be written as: λ (m) = 2.998 × 10⁸ / f (Hz).
   

2. For → sound waves: λ = C / f, where C is the → sound speed. For air at temperature 0°C, λ (m) = 332 / f (Hz).

See also: → frequency; → wavelength; → conversion.