In a singly-ionised helium atom (He )

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics

Problem

In a singly-ionised helium atom (He

^{+}

), the energies of the third and second Bohr orbits are

-6.04\,\text{eV}

and

-13.6\,\text{eV}

respectively. Calculate the wavelength of the photon emitted when the electron falls from the third to the second orbit. (Take

hc = 1240\,\text{eV\,nm}