A cathode emits $1.8 \times {10^{14}}$ electrons per second, when heated. When $ 400\;V$ is applied to anode all the emitted electrons reach the anode. The charge on electron is $1.6 \times {10^{ - 19}}\;C$. The maximum anode current is ............ $\mu A$
$2.7$
$29$
$72$
$2.9$
Electron volt is a unit of
Write speed of cathode rays.
Three particles having their charges in the ratio of $1 : 3 : 5$ produce the same spot on the screen in Thomson’s experiment. Their masses are in the ratio of
In Milikan’s experiment, an oil drop having charge $q$ gets stationary on applying a potential difference $V$ in between two plates separated by a distance $‘d’$. The weight of the drop is
Cathode rays consist of