(a) On what principle does lighting in a fluorescent tube operate?
(b) State two factors which determine the colour of light produced in a fluorescent tube.
Explanation
(a) Fluorescent tube operate on the principle of electrical discharge through a gas at very low pressure and very high voltage.
(b) Factors which determine the colour of light in a fluorescent tube are: -voltage across the tube -nature of gas in the tube -nature of powder coating inside the tube.