The mass of the electron varies with
The size of the cathode ray tube
The variation of $‘g’$
Velocity
Size of the electron
Cathode rays consist of
The specific charge of an electron is
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
An electron is accelerated through a potential difference of $200$ volts. If $e/m$ for the electron be $1.6 \times {10^{11}}$ $coulomb/kg$ , the velocity acquired by the electron will be
Cathode rays are produced when the pressure is of the order of