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A certain diatomic molecule absorbs energy by vibrating. The first excited vibrational state is at an...

A certain diatomic molecule absorbs energy by vibrating. The first excited vibrational state is at an energy of 2.0 meV above the ground state. What is the energy of the second excited vibrational state above the ground state? (a) 2.5 meV (b) 4.0 meV (c) 6.0 meV (d) 8.0 meV

The correct answer is B , please show me how it is that.

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