(a) Explain how neon signs can be produced.
(b) State two factors on which the colour of light from a fluorescent tube depend.
Verified Correct Answer: .
Physical Principles & Numerical Solution
(a) A discharge tube at very high p.d. filled with neon and evacuated to a very low pressure of about 5mm will produce a discharge between the electrodes with a characteristic colour.
(b) The colour depends on;
- nature of the gas in the tube.
-nature of coating inside the tube
Source: Myschool Past Questions Archive (Record #54086)