They are streams of fast moving electrons.
J.J. Thomson’s Experiment
eV = 1/2 mv2 = e/m = v2/2V ⇒ = e2/2VB2
em = 1.77×1011 C/kg.
Millikan’s Oil Drop Experiment
Milikan performed the pioneering oil drop experiment for the precise measurement of the charge on the electron.
In this experiment charge on the drop is given by
q = 6πη(V1v2)d/v [9ηV1/2g(ρ- σ)]1/2
Positive Rays or Canal Rays
(q/m)v or positive rays is much smaller than that of cathode rays and is not a universal constant.