Science Bowl Question

W) In neutral hydrogen, very high electron energy levels are close together, so a low-energy photon is emitted in a transition between levels

X) In molecular hydrogen, rotational energy is quantized with small differences between levels, so a low-energy photon is emitted when the rotation changes

Y) In neutral hydrogen, ground state electrons have a slightly higher energy when the spin is anti-aligned with that of the proton than when it is aligned, so a low-energy photon is emitted when the spin flips

Z) In neutral hydrogen, ground state electrons have a slightly higher energy when the spin is aligned with that of the proton than when it is anti-aligned, so a low-energy photon is emitted when the spin flips