$A$ quantum will have more energy if :

In a hydrogen atom,the minimum energy required to excite an electron from the $2^{nd}$ orbit to the $3^{rd}$ orbit is: (in $eV$)

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

Alpha-particles that come closer to the nucleus:

The wavelength of the radiation emitted,when in a hydrogen atom an electron falls from infinity to stationary state $n=1$,would be ............... $nm$ (Rydberg constant $= 1.097 \times 10^7 \ m^{-1}$)

Find the frequency of light that corresponds to photons of energy $5.0 \times 10^{-5} \ erg$.