Given the energy equation $E_n = -313.6/n^2$,if $E_n = -34.84$,which of the following could be the value of $n$?

One energy difference between the states $n = 2$ and $n = 3$ is $E \ eV$,in a hydrogen atom. The ionization potential of the $H$ atom is ............. $E$.

What is the difference in the line spectrum of different atoms compared to the hydrogen atom?

The electron present in an excited state of $He^{+}$ ion shows separation (ionization) on collision with an electron having $2.5 \ eV$ energy. What will be the minimum value of $n$ for this electron of $He^{+}$ ion?

What is the ratio of the velocity of an electron in the ground state of a hydrogen atom to the velocity of an electron in the second excited state of $He^{+}$?

The figure that is not a direct manifestation of the quantum nature of atoms is: