Three photons coming from excited atomic-hydrogen sample are picked up. Their energies are $12 \cdot

Question

Three photons coming from excited atomic-hydrogen sample are picked up. Their energies are $12 \cdot 1 \mathrm{eV}$, $10 \cdot 2 \mathrm{eV}$ and $1 \cdot 9 \mathrm{eV}$. These photons must come from

Professor PC Thomas Classes · Answer

See detailed solution for explanation.