(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.