Positive rays was discovered by
Thomson
Goldstein
W. Crookes
Rutherford
In a Millikan's oil drop experiment the charge on an oil drop is calculated to be $6.35 \times {10^{ - 19}}C$. The number of excess electrons on the drop is
Cathode rays are similar to visible light rays in that
Cathode rays consist of
The cathode rays have particle nature because of the fact that
In an electron gun the control grid is given a negative potential relative to cathode in order to