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When a certain material is illuminated with visible light, electrons jump from lower to higher energy states in atoms of the material. When illuminated by ultraviolet light, atoms are ionized as some of them eject electrons. Why do the two kinds of illumination produce such di...
Since an absorbing gas reemits the light it absorbs, why are there dark lines in an absorption spectrum? That is why doesn't the reemitted light simply fill in the dark places?
A lamp fimament is made of tungsten. Why do we get a continuous spectrum rather than a tungsten line spectrum when light from an incandescent lamp is viewed with a spectroscope?
Why doesn't a neon sign finally run out of excited atoms and produce dimmer and dimmer light?
Ultraviolet light causes sunburns, whereas visible light, even of greater intensity, does not. Why?
what are possive pronouns