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Physics Paper 2, MAy/June. 2010  
Questions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Main
General Comments
Weakness/Remedies
Strength
Question 7

State one reason each why cathode rays:
(a)are not electromagnetic waves;
(b)cast sharp shadows of objects in their path;
(c) can rotate a light paddle wheel inside a discharge tube

Observation

Candidates' responses were quite poor due to poor understanding of properties of cathode rays e.g. some candidates stated that cathode rays possess energy as against the fact that they possess momentum.
The expected answers are:
Because they
(a) are deflected by electric and/or magnetic field(s)
(b)travel in straight paths (rectilinear propagation)
(c)posses momentum

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