(a) What is the principle upon which the lighting in fluorescent tubes operate? (b) State two factors on which the colour of light from a fluorescent tube d...
Question 1 Report
(a) What is the principle upon which the lighting in fluorescent tubes operate?
(b) State two factors on which the colour of light from a fluorescent tube depends.
Answer Details
(a) Principle of the fluorescent tube. It works on the principle of fluorescence. An electric discharge is passed through mercury vapour in the tube; the excited mercury atoms emit ultraviolet radiation. This ultraviolet light strikes the fluorescent (phosphor) powder coating the inside of the tube, which absorbs the invisible ultraviolet and re-emits the energy as visible light.
(b) Two factors on which the colour of the light depends:
- The nature (chemical composition) of the fluorescent powder (phosphor) coating the tube.
- The nature of the gas or vapour (and the pressure) inside the tube.
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