Normally,the time taken in an electronic transition is approximately:

Find the frequency and wavelength of light required for the ionization of the solution. (Ionization energy of the solution $= 8.2 \times 10^{-19} \ J$)

What is the wave number of the lowest energy transition in the Balmer series?

When light is directed at the metal surface,the emitted electrons

The ratio of the energy of the $He^{+}$ ion in its first and second excited states will be:

The ionization energy of a hydrogen atom is $13.6 \, eV$. What is the energy required (in $eV$) to excite the electron from the ground state to the first excited state?