Part (a) was fairly popular with the candidates but those who wrote cathode rays travel in a straight line did not earn mark for it because they were expected to add in “field free space” to earn the point.
Part (b) was not well attempted. The expected answers are:
(a) Properties of cathode rays:
Cathode rays
- are negatively charged.
- travel in straight line in field free space.
- are deflected by electric/magnetic field.
- possess(kinetic) energy.
- possess momentum.
(b)(i) The intensity of cathode rays may be increased by raising the temperature of the cathode/increasing the current through the heater.
(ii) The energy of cathode rays may be increased by raising the potential difference between
the anode and the cathode/the anode potential.
