Wavelength
Definition
The distance between successive crests (or troughs) of a wave, measured in meters. Related to frequency by: λ = c / f.
Why is Wavelength Important?
Wavelength is a core physics concept that describes the fundamental behavior of matter and energy. Understanding this principle enables engineers, students, and scientists to design better systems, solve real-world problems, and predict physical phenomena with precision.
Our physics calculators make it easy to compute values related to this concept, bridging the gap between theoretical understanding and practical application in engineering, education, and research.
What is Wavelength?
Wavelength (λ) is the distance between successive crests, troughs, or identical points of a wave. It is measured in meters (or nanometers for light). Wavelength is inversely related to frequency: λ = c/f (or v/f for non-electromagnetic waves).
The Electromagnetic Spectrum
| Type | Wavelength | Frequency | Common Use |
|---|---|---|---|
| Radio waves | 1 mm – 100 km | 3 kHz – 300 GHz | AM/FM radio, TV, WiFi |
| Microwaves | 1 mm – 1 m | 300 MHz – 300 GHz | Microwave ovens, 5G, radar |
| Infrared | 700 nm – 1 mm | 300 GHz – 430 THz | Remote controls, thermal imaging |
| Visible light | 380–700 nm | 430–790 THz | Human vision |
| Ultraviolet | 10–380 nm | 790 THz – 30 PHz | Sunburn, sterilization |
| X-rays | 0.01–10 nm | 30 PHz – 30 EHz | Medical imaging |
| Gamma rays | < 0.01 nm | > 30 EHz | Cancer treatment, nuclear |
Visible Light Wavelengths
| Color | Wavelength (nm) |
|---|---|
| Red | 620–750 |
| Orange | 590–620 |
| Yellow | 570–590 |
| Green | 495–570 |
| Blue | 450–495 |
| Violet | 380–450 |