In a hydrogen atom

CHEMISTRY · Subjective · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

In a hydrogen atom, an excited electron drops from the

n=3

level to the ground state (

n=1

) via a two-step cascade. The first photon emitted in the cascade has a wavelength of

656\,\text{nm}

. Calculate the wavelength, in nanometres, of the second photon emitted.