Wavelength & Frequency Calculator
Wavelength is the distance between two consecutive peaks (or troughs) of a wave. Together with frequency and wave speed, it describes how waves travel through space. The formula λ = v/f relates all three.
- 1λ = v / f (wavelength = wave speed / frequency)
- 2For electromagnetic waves: v = c = 3 × 10⁸ m/s
- 3Frequency f is in Hz (cycles/second)
- 4Wavelength λ is in metres
FM radio at 100 MHz=λ = 3.0 m3×10⁸ / 10⁸ = 3 m
Red light at 700 nm=f ≈ 4.3 × 10¹⁴ Hzc / λ
| Type | Wavelength range | Frequency range |
|---|---|---|
| Radio | > 1 mm | < 300 GHz |
| Microwave | 1 mm – 1 m | 300 MHz – 300 GHz |
| Infrared | 700 nm – 1 mm | 300 GHz – 430 THz |
| Visible light | 380 – 700 nm | 430 – 790 THz |
| Ultraviolet | 10 – 380 nm | 790 THz – 30 PHz |
| X-ray | 0.01 – 10 nm | 30 PHz – 30 EHz |
| Gamma ray | < 0.01 nm | > 30 EHz |
References
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