If an electron oscillates at a frequency of $ 1 GHz$ it gives
$ X-$ rays
Mirowaves
Infrared rays
None of these
When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
The mass of a particle is $400$ times than that of an electron and the charge is double. The particle is accelerated by $5 V$. Initially the particle remained in rest, then its final kinetic energy will be ........... $eV$
Write speed of cathode rays.
A cathode emits $1.8 \times {10^{14}}$ electrons per second, when heated. When $ 400\;V$ is applied to anode all the emitted electrons reach the anode. The charge on electron is $1.6 \times {10^{ - 19}}\;C$. The maximum anode current is ............ $\mu A$
In a Millikan's oil drop experiment the charge on an oil drop is calculated to be $6.35 \times {10^{ - 19}}C$. The number of excess electrons on the drop is