Define work function of metal and write its unit.
The mass of the electron varies with
An electron is moving in electric field and magnetic field it will gain energy from
In $1897$, J.J.Thomson invented which particle ?
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
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