In Millikan’s oil drop experiment, an oil drop of mass $16 \times {10^{ - 6}}kg$ is balanced by an electric field of ${10^6}V/m.$ The charge in coulomb on the drop, assuming $g = 10\,m/{s^2}$ is
$6.2 \times {10^{ - 11}}$
$16 \times {10^{ - 9}}$
$16 \times {10^{ - 11}}$
$16 \times {10^{ - 13}}$
Cathode rays consist of
An $\alpha$ particle is accelerated through a p.d of ${10^6}$ volt then $ K.E$ . of particle will be .......... $MeV$
Kinetic energy of emitted cathode rays is dependent on
The current conduction in a discharged tube is due to
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