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
$B$ is increased $208$ times
$E$ is increased $208$ times
$B$ is increased $14.4$ times
None of these
In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is
A charge of magnitude $3e$ and mass $2m$ is moving in an electric field $\overrightarrow E .$ The acceleration imparted to the charge is
Electron volt is a unit of
Explain emission of electron from metal. Define work function. Write its unit, work function of metal depend on which factors ?
The cathode rays have particle nature because of the fact that