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
$\frac{{2eV}}{m}$
$\sqrt {\frac{{2eV}}{m}} $
$\sqrt {\frac{{2m}}{{eV}}} $
$\frac{{{V^2}}}{{2em}}$
Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if
If an electron oscillates at a frequency of $ 1 GHz$ it gives
In Thomson experiment of finding $e/m$ for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass $208$ times that of electrons). No deflection condition in this case satisfied if
Cathode rays are produced when the pressure is of the order of
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