Definition

1. Noun:
   • A quantity in physics representing the spatial frequency of a wave: The wave number is defined as the number of wavelengths per unit distance. It is the reciprocal of the wavelength, often used in spectroscopy and wave mechanics.
   • A scalar quantity in wave propagation: It measures how many wave cycles exist in a given unit of length, indicating the spatial scale of the wave's oscillation.

Usage Examples

• Noun:
  • The wave number is a fundamental parameter for characterizing electromagnetic radiation.
  • Scientists calculated the wave number from the measured wavelength of the light.

Advanced Usage

• "angular wave number": Often denoted by the symbol , this is the wave number multiplied by 2π, representing the spatial frequency in radians per unit distance.
  • The angular wave number is crucial for solving the wave equation.

Variants and Related Words

• Wavenumber (noun): An alternative spelling of "wave number," often written as one word in technical contexts.
  • The wavenumber was plotted against the signal intensity.

Synonyms

• Spatial frequency: A more general term for the number of waves per unit distance.
• Repetency: A less common synonym for wave number.

Related Terms and Concepts

• Wavelength (noun): The distance over which a wave's shape repeats; it is the reciprocal of the wave number.
• Frequency (noun): The number of wave cycles per unit time, related to wave number via the wave's speed.

Noun

1. the reciprocal of the wavelength of a wave