1. Consider a Harmonic oscillator. Given is the potential energy curve.
How can you determine the force constant K?
(A) By taking the 1st derivative of the potential energy curve.
(B) By taking the 2nd derivative of the potential energy curve.
(C) By finding the minimum of the potential energy curve.

2. Consider a Harmonic oscillator. Given is the potential energy curve.
How can you determine the force constant K?
(A) By taking the 1st derivative of the potential energy curve.
(B) By taking the 2nd derivative of the potential energy curve.
because, if V(x) = ½ K x2, then K = d2V/dx2
(C) By finding the minimum of the potential energy curve.

3. Which of the vibrations in CO2 are NOT infrared-active?
(A) The symmetric stretching mode
(B) The bending modes
(C) The bending mode

4. Which of the vibrations in CO2 is NOT infrared-active?
(A) The symmetric stretching mode
(B) The bending modes
(C) The antisymmetric stretching mode