Convert between frequency and wavelength for light or sound — enter either value and get the other, using the wave speed for the medium you pick.
Using v = 343 m/s (sound in air at 20°C).
Wavelength and frequency are inversely related through wave speed, following the relationship wavelength × frequency = wave speed (λf = v) — for any given wave speed, a higher frequency always means a shorter wavelength, and vice versa.
For light in a vacuum, that speed is the well-known constant c ≈ 299,792,458 metres per second. For sound, it's much slower — roughly 343 metres per second in air at room temperature — which is why converting between frequency and wavelength gives very different numbers depending on whether you're working with light or sound.
Selecting a different medium changes the wave speed used in the calculation, since sound (and to a lesser extent, light) travels at different speeds through different materials — sound moves faster through water than air, for example, so picking the right medium matters for an accurate conversion.
They're inversely related through wave speed: wavelength × frequency = speed (λf = v). Higher frequency always means shorter wavelength for the same wave speed, and vice versa.
Light is an electromagnetic wave that travels at c in a vacuum regardless of medium (though it slows slightly in materials like glass or water). Sound is a mechanical wave that needs a medium to travel through at all, and its speed depends heavily on that medium's density and stiffness — much faster through solids like steel than through air.
Yes, meaningfully — sound in air speeds up by roughly 0.6 m/s per °C. The "sound in air" preset here uses 343 m/s, the standard reference figure for 20°C; colder or hotter air will shift the real value.
