A molecule with angular momentum L and moment of inertia I has a rotational energy [tex]E = L^2 / 2I[/tex]. Since angular momentum is quantized, find the wavelength of the photons emitted in n=2 to n=1 transition of the H2 molecule. This molecule has a moment of inertia [tex]I = [tex]0.5mr^2[/tex], where m = 938Mev/c^2 and r = 0.074nm.(adsbygoogle = window.adsbygoogle || []).push({});

My attempt is to say [tex]L = [[l(l+1)]^.5}\hbar[/tex] and use l =2 for n=2 state and l = 1 for n=1. Put these values for L into the equation for E.

Then E2 - E1 = [tex] \triangle E. [/tex]

[tex] \triangle E = hf, v = \lambda f. [/tex]

=> [tex] \lambda = hv / \triangle E = hc / \triangle E [/tex]

I've no idea if I'm on the right track, couldn't find anything similar in the textbook.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Atomic Spectra

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**