When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
Positive rays
$X-$rays
Gamma rays
Canal rays
In Thomson spectrograph experiment, four positive ions $P,Q,R$ and $S$ are situated on $Y-X$ curve a shown in the figure
In $1897$, J.J.Thomson invented which particle ?
Who produced electromagnetic waves for the first time ?
An electron beam is moving between two parallel plates having electric field $1.125 \times {10^{ - 6}}N/m$. A magnetic field $3 \times {10^{ - 10}}T$ is also applied so that beam of electrons do not deflect. The velocity of the electron is ............ $m/s$
A metal plate gets heated, when cathode rays strike against, it due to