Wavenumber
Reference from the original Physics I textbook.
- Wavenumber
The angular wavenumber k gives the spatial rate of phase change: k = 2π/λ, in rad/m.
- Related Glossary Terms
- Index
Reviewed physics notes (1)
These corrections keep the original lesson’s purpose while fixing errors in the source edition.
- Original describes a wavelength count without length units. — Reference 1
Glossary and deeper reading · 2 refreshers
These editorial refreshers supplement the reading. Definitions and examples are added guidance; original source wording and recorded answers remain in their original context.
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Wavenumber
Angular wavenumber measures the change of wave phase per unit distance. In the sinusoidal convention used in the source reading, it equals two pi divided by wavelength and is measured in radians per meter. For example, shortening a wave’s wavelength increases its angular wavenumber.
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Frequency
Frequency is the number of complete repeating cycles per unit time. It is measured in hertz, meaning cycles per second, and is the reciprocal of the period. For example, a vibrating string with a higher frequency produces more cycles each second.