Why are fluorescence and phosphorescence useful?
Fluorescence is the the property of absorbing light of short wavelength and emitting light of longer wavelength. Fluorescence seen in the redness of rubies, in sunlight, in fluorescent markers, and in 'Day-Glo' or 'neon' colours. There are many other uses for fluorescence too. It is used in neon lights, highway lights, TVs, computers, microscopes, and paints.
There are numerous uses for phosphorescence in daily life. Apart from glow in the dark toys, phosphorescence is used for more sophisticated needs. Many watches are developed with phosphorescent materials on their hands so the user can tell the time in the dark.
Phosphorescent substances are used in paints, on electric switch boards and sign boards. Emergency routes, doors, and stairways are often marked with these paints. These substances absorb sunlight during the day time, and use the stored energy to glow after dark.
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