That is, if you observe the spectrum of a star and can determine the wavelength where the emission peaks (Î»max), you can calculate that starâs temperature. Here is another copy of the plot that we studied in Lesson 3: Figure 4.1: Two-dimensional plot of the spectrum of a blackbody with different temperatures.
Igneous rocks usually contain the most crystals. The longer it takes the magma to cool, the larger the crystals.
The Ouachita Mountains (pronounced wa-she-tah) that extend from Eastern Oklahoma to Central Arkansas are one of the most important sources of rock crystals. They have produced splendid crystals in large quantities for more than 150 years, rivaled only by Brazil and Madagascar.