By using this formula E=1/2 Ia wa^2 +1/2 Ib wb^2 +1/2 Ic wc^2. calculate the spacing in (1/cm) between the following vibrational levels in the upper electronic state of I2: A) between v=1 and v= 0: b) between v=4 and v=3; and between v=21 and v=20. comment on and explain this trend in terms of the quantum mechanical concept of constraint.