Your Guide to Science Fair Topics, Ideas, Experiments, and Winning Displays
Luminescence Is Cold Light Luminescence is referred to as “cold light.” This because luminescence is the name given to all forms of visible radiant energy (visible light) due to causes other than temperature. The term ‘luminescence’ was introduced in 1888 by Eilhard Wiedemann. Visible light produced by temperature changes is called incandescence. Luminescence can be [...]
Question: What causes some objects to glow under a black light? Black lights give off Ultraviolet A light, which is a type of high-energy invisible light (radiation). Photons are packets of light energy. UV light photons have a higher energy than do the photons for visible light. Materials that glow under a black light contain [...]
Fluorescence and Photoluminescence are types of luminescence (cold light) where the energy is supplied by EMR (electromagnetic radiation). EMR from most to least energetic are: gamma rays, x-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves. The starting EMR energy source needed to produce visible light must be more energetic than visible light. [...]
ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years.
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