In an emission spectrum,the transitions $n_2 \to n_1$,$n_3 \to n_2$,$n_4 \to n_3$,and $n_5 \to n_4$ emit energies $E_1, E_2, E_3$,and $E_4$ respectively. What is the increasing order of these energies?
- A$E_1 < E_2 < E_3 < E_4$
- B$E_4 < E_3 < E_2 < E_1$
- C$E_1 = E_2 = E_3 = E_4$
- D$E_2 < E_1 < E_4 < E_3$
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