The energy of a vibrating molecule is quantized much like the energy of an electron in the hydrogen atom. The energy levels of a vibrating molecule are given by the equation En = (n +1/2)hv  where n is a quantum number with possible values of 1, 2,..., and n is the frequency of vibration. The vibration frequency of HCl is approximately 8.85x10^13 s^-1. What minimum energy is required to excite a vibration in HCl? What wavelength of light is required to excite this vibration?

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