The ratio of the kinetic energies of the electrons in the third and fourth excited states of hydrogen atom is
In $\beta^{-}$decay, a neutron transforms into a proton within the nucleus according to the equation :
neutron $\rightarrow$ proton $+\beta^{-}+x$
In this equation the particle represented by ' $x$ ' is
Two radioactive substances $A$ and $B$ have same number of initial nuclei. If the half lives of $A$ and $B$ are 1.5 days and 4.5 days respectively, then the ratio of the number of nuclei remaining in $A$ and $B$ after 9 days is
$10^{10}$ electrons enter the emitter of a junction transistor in a time of $0.4 \mu \mathrm{~s}$. If $5 \%$ of the electrons are lost in the base, then the collector current is
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