Which term describes a material that changes colour in response to light?

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Multiple Choice

Which term describes a material that changes colour in response to light?

Explanation:
Color change triggered by light is described by photochromism. When such a material is exposed to light, its molecular structure or electronic state shifts in a way that changes which wavelengths are absorbed, so the color you see changes. Once the light is removed (or after some thermal relaxation), the material usually returns to its original color. This distinguishes it from thermochromism, which changes with temperature, and from luminescence, which is the emission of light rather than a change in the material’s color. While photochromicity is a term you might see, the standard, widely used term for the phenomenon is photochromism.

Color change triggered by light is described by photochromism. When such a material is exposed to light, its molecular structure or electronic state shifts in a way that changes which wavelengths are absorbed, so the color you see changes. Once the light is removed (or after some thermal relaxation), the material usually returns to its original color. This distinguishes it from thermochromism, which changes with temperature, and from luminescence, which is the emission of light rather than a change in the material’s color. While photochromicity is a term you might see, the standard, widely used term for the phenomenon is photochromism.

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