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Frequency Wavelength Converter - Free Online Calculator | Nice Calculators
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Frequency-Wavelength Converter

Convert between frequency and wavelength for electromagnetic waves in various media.

Settings

Enter a valid positive speed.

Input Frequency

Please enter a valid number.

Output Wavelength

Quick Examples (Light in Vacuum)

Frequency, Wavelength, and Speed

Frequency (f), wavelength (λ), and the speed of propagation (c or v) of a wave are related by the fundamental equation: c = f × λ.

  • Frequency (f): The number of wave cycles that pass a point per unit of time. SI unit: Hertz (Hz), which is 1/second.
  • Wavelength (λ): The spatial period of the wave, the distance over which the wave’s shape repeats. SI unit: meter (m).
  • Speed of Propagation (c or v): The speed at which the wave travels through a medium. For electromagnetic waves in a vacuum, this is the speed of light (c ≈ 299,792,458 m/s). This speed changes in different media.
Approximate Speeds of Light in Different Media
Medium Speed (m/s) Refractive Index (n ≈ cvacuum/vmedium)
Vacuum 299,792,458 (exact by definition) 1 (exact)
Air (STP) ~299,700,000 ~1.0003
Water (20°C) ~225,000,000 ~1.333
Glass (Crown) ~197,000,000 ~1.52

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