Blue light from mercury discharge tube

Blue light from mercury discharge tube

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Credit: R. MEGNA/FUNDAMENTAL PHOTOS/SCIENCE PHOTO LIBRARY

Caption: Mercury discharge tube. Blue light emitted by a mercury vapour discharge tube. The tube contains mercury vapour at low pressure. When a current is applied, electrons in the mercury atoms are excited. Light is emitted when the excited electrons fall back to lower energy levels.

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Keywords: discharge lamp, discharge tube, electrical, electricity, energy, industry, mercury, mercury light, mercury vapour lamp, physics, technology

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