When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
Positive rays
$X-$rays
Gamma rays
Canal rays
In an electron gun, the electrons are accelerated by the potential $V$. If e is the charge and $m$ is the mass of an electron, then the maximum velocity of these electrons will be
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
Energy of electrons can be increased by allowing them
A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ potential diffrence between kethod and anode)
In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is