The visible light spectrum (a model for the energy of photons) is ordered according to wavelenth. Shorter waves of light have higher energy (higher frequency). Visible light can be split into red (lower energy), orange, yellow, green, blue, indigo, and violet (higher energy). Fluorescence is a phenomenon in which certain pigments emit light at lower energy than they receive, and thus can't be activated by wavelengths of light with less energy than the color they are. What wavelength of light would NOT cause yellow highlighter to fluoresce?

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