Question

Calculate the energy required to excite the hydrogen electron from level n 1 to level n 2. Also calculate the wavelength of light that must be absorbed by a hydrogen atom in its ground state to reach this excited state.

Answer 1

the energy required is 10.2eV and the wavelength required is approx.1240A°

Answer 2

how come energy requires to be 10.2eV and wavelength required is approx 124A