In a normal Zeeman effect experiment, spectral splitting of the line at wavelength 656 nm corresponding to the transition 31P2 → 31S1 is to be observed. If the spectrometer has a resolution of 0.008 nm, the minimum magnetic field needed to observe this splitting is approximately:

The bond dissociation energy of the OH molecule is 4.18 eV with a rotational constant of 18.8 cm-1. For rotationally induced dissociation, the minimum value of the rotational quantum number J is closest to:

Consider an emission line of wavelength λ = 550 nm of Argon (A = 40, Z = 18) at a temperature of 400 K. The full Doppler width of the emission line will be closest to: