Helium can be excited from its ground state to its first excited state with an electric discharge. When this excited state helium relaxes back down to the ground state it can emit a photon of wavelength 125 nm. What is the energy of a photon with that wavelength? 1.6 x 10-18 J

1.6 x 10+18 J

5.6 x 10-23 J

5.6 x 10+23 J

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.