What is fluorescence?

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Multiple Choice

What is fluorescence?

Explanation:
Fluorescence is the emission of visible light by a substance that has absorbed energy in the ultraviolet range. When UV photons are absorbed, electrons are promoted to higher energy levels, and as they relax back down, they release photons in the visible spectrum. The emitted light has lower energy (longer wavelength) than the absorbed light, and this glow occurs while the exciting light is still present. This distinguishes it from processes that would convert visible to UV or infrared to visible, or from gamma emission, which is not fluorescence.

Fluorescence is the emission of visible light by a substance that has absorbed energy in the ultraviolet range. When UV photons are absorbed, electrons are promoted to higher energy levels, and as they relax back down, they release photons in the visible spectrum. The emitted light has lower energy (longer wavelength) than the absorbed light, and this glow occurs while the exciting light is still present. This distinguishes it from processes that would convert visible to UV or infrared to visible, or from gamma emission, which is not fluorescence.

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