The frequency of radiation absorbed or emitted when transition occurs between two stationary states with energies $E_1$ (lower) and $E_2$ (higher) is given by
- A$v = \frac{E_1+E_2}{h}$
- B$v = \frac{E_1 - E_2}{h}$
- C$v = \frac{E_1 \times E_2}{h}$
- D$v = \frac{E_2 - E_1}{h}$
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