1. The problem statement, all variables and given/known data "Vibrational spectroscopic studies of HCl show that the radiation absorbed in a transition has frequency 8.63*10^13 Hz. Calculate the vibrational frequency of the molecule in this transition." 2. Relevant equations E_n=(n+1/2)hv v=(1/(2pi))(sqrt(k/μ)) 3. The attempt at a solution I know I'm supposed to calculate the energy absorbed in the transition first, so: E = hv E = (6.626*10^-34)(8.63*10^13) E = 5.72*10^-20 J From here, I guess I'll have to use the equation: E_n=(n+1/2)hv, but what n value(s) do I use? Kind of confused here. Thanks.