Which of the following will have the least value of $\frac{q}{m}$
Electron
Proton
$\alpha$ -particle
$\beta$-particle
Explain emission of electron from metal. Define work function. Write its unit, work function of metal depend on which factors ?
Which scientist invented cathode rays ?
A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ potential diffrence between kethod and anode)
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
A metal plate gets heated, when cathode rays strike against, it due to