Wavelength is the distance between consecutive peaks of a wave. It is inversely proportional to frequency.

Why is speed of light the default?

Many wavelength calculations involve electromagnetic waves (light, radio), which travel at c ≈ 299,792,458 m/s in vacuum.

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What is wavelength?: Wavelength is the distance between consecutive peaks of a wave. It is inversely proportional to frequency.
Why is speed of light the default?: Many wavelength calculations involve electromagnetic waves (light, radio), which travel at c ≈ 299,792,458 m/s in vacuum.