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Which visible colour has the shortest wavelength?

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A circular RYB color wheel divided into twelve segments, showing a progression of colors from red, orange, and yellow to green, blue, and violet. — colour The RYB color model is being illustrated on a color wheel.

Within the visible spectrum, the colour with the shortest wavelength is violet.12

While the limits of human perception can vary, the wavelength range for violet light is typically identified as approximately 380 to 450 nanometres. Wavelengths shorter than this range fall into the ultraviolet radiation region, which is not discernible to the human eye.12