An Oscillating Diatomic Molecule Can Be Modeled as a Massless $\mu$

Multiple Choice

An oscillating diatomic molecule can be modeled as a massless spring with force constant k that is connecting two pointlike masses that can be represented by a reduced mass $\mu$ . For a particular molecule the reduced mass is $1.5 \times 10 ^ { - 26 } \mathrm {~kg}$ , and the vibrational energy levels are spaced 0.15 eV apart. The effective force constant of the chemical bond is

A) 120 N/m.
B) 480 N/m.
C) 780 N/m.
D) 1200 N/m.