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
$8 \times {10^6}\,m/s$
$8 \times {10^5}\,m/s$
$5.9 \times {10^6}\,m/s$
$5.9 \times {10^5}\,m/s$
When the speed of electrons increases, then the value of its specific charge
Write and explain methods to obtain emission of electron from metal.
Which of the following is not the property of a cathode ray
Write dimensional formula and electron volt of electron volt.
A charge of magnitude $3e$ and mass $2m$ is moving in an electric field $\overrightarrow E .$ The acceleration imparted to the charge is