The most probable radius (in $pm$) for finding the electron in $He^{+}$ is

The energy of the first (lowest) Balmer line of the $H$ atom is $x \ J$. The energy (in $J$) of the second Balmer line of the $H$ atom is:

In Bohr's model of an atom,when an electron jumps from $n = 1$ to $n = 3$,how much energy is absorbed?

The energy of the third orbit of $Li^{2+}$ ion (in $J$) is

What is the value of the frequency of radiation when a transition occurs between two stationary states that differ in energy by $\Delta E$?

Assertion : For Balmer series of hydrogen spectrum,the value $n_1 = 2$ and $n_2 = 3, 4, 5...$
Reason : The value of $n$ for a line in Balmer series of hydrogen spectrum having the highest wavelength is $4$ and $6$.