Question

the particle nature of cathode rays is supported by its ability to
A Travel through vacuum
B Travel in straight lines
C Cause thermalmotion
D Produce phosphorescence

Answer 1

Particle nature of cathode rays is supported by their ability to travel in straight lines which is due to the approximately uniform electric field between anode and cathode. Although electrons usually travel in parabolas, in case of cathode rays, there is no much transverse velocity. So, they travel in straight lines or nearly straight curves.