State (a) the principle upon which the lightening in fluorescent tubes operate; (b) two factors...
PHYSICS
WAEC 2005
State (a) the principle upon which the lightening in fluorescent tubes operate;
(b) two factors on which the colour of light from a fluorescent tube depends.
Explanation
(a) Lightening in fluorescent tubes operate on the principle of electric discharge through low pressure gas.
(b) Colour of light from fluorescent tube depend on (i) Nature of the coating inside the tube (ii) Nature of the gas in the tube.
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