Physics Paper 2, Nov/Dec. 2012  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments

Question 8

  1. On what principle does lighting in a fluorescent tube operate?
  2. State two factors which determine the colour of light produced in'a fluorescent tube.

 This is popular among the candidates part(b) posed no problem to most responding however, in pan (a) most of candidates lost the mark for not including very to quality km pressure and high voltage
The expected answers are:

  1. Electrical discharge through a gas at very low pressure and maintained m high voltage
  2. Two factors which determine the colour of light in a fluorescent tube
  3. Nature of gas in the tube
  4. Nature of powder coating inside the tube
  5. Voltage across the tube.
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