| 1 | Red and violet are at opposite ends of the spectrum. | |
| 2 | We are looking at other planets and their spectral signatures. | |
| 3 | So we're looking only for the neutrons at energy E from this spectrum. | |
| 4 | The respectful spectator gave the prospective president a retrospect of the spectacular spectrum. | |
| 5 | He applied it to the problem of the electron in the hydrogen atom and worked out the spectrum of hydrogen. |