The third line in the Balmer series corresponds to an electronic transition between which Bohr's orbits in hydrogen?

The quantity $h \nu / K_{B}$ corresponds to

In the hydrogen spectrum,if an electron transitions from the $6^{th}$ orbit to the $3^{rd}$ orbit through multiple steps,what is the total number of spectral lines in the $U.V.$ region?

Which of the following provisions of the Bohr atomic model of hydrogen turned out to be false?

The frequency of the first line of the Paschen series in the spectrum of the $Be^{+3}$ ion is:

The energy difference of two stable orbits of Hydrogen is $214.68 \ kJ \ mol^{-1}$. If the transition of an electron takes place,find the emitted frequency. (Note: $v = \Delta E/h$ and $h = 6.626 \times 10^{-34} \ J \ s$)