A hydrogen atom initially in the state drops directly to the state

PHYSICS · Subjective · CBSE · Physics · Atoms · Atoms

Problem

A hydrogen atom initially in the

n=5

state drops directly to the

n=2

state. The energies of these two levels are

-0.54\text{ eV}

(for

n=5

) and

-3.40\text{ eV}

(for

n=2

). Calculate the wavelength of the photon that is emitted. Give your answer in nanometres.