A mercury filled discharge tube produces numerous strong spectral bands. The spectrum of the mercury-filled fluorescent lights in the lab shows three strong bands (one red, one green, and one blue) why?
The mercury discharge lamps contains mercury and is coated with flourescent material.
When electric current is passed through the tubes the mercury produced high energy UV-rays.
The high energy UV-rays ar capable of ineracting with the flourescent coating resulting in production of visible light. The electrons emitted from mercury will knock out electrons from the flouresent coating material.
The light emitted by the flourescent lamp will be in the range of red , green and blue.
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