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 ............ $\mu A$
$2.7$
$29$
$72$
$2.9$
The cathode rays have particle nature because of the fact that
Write and explain methods to obtain emission of electron from metal.
An oxide coated filament is useful in vacuum tubes because essentially
Cathode rays are
Explain emission of electron from metal. Define work function. Write its unit, work function of metal depend on which factors ?