Problem: The spectra of hydrogen and of calcium are shown in the following figure. What causes the lines in these spectra? Why are the colors of the lines different? Suggest a reason for the observation that the spectrum of calcium is more complicated than the spectrum of hydrogen.

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Given a line or atomic spectra, the emitted radiation is identified by bright lines in the spectra.

This spectral line is unique to a specific atom, element, or molecule. 

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The spectra of hydrogen and of calcium are shown in the following figure. What causes the lines in these spectra? Why are the colors of the lines different? Suggest a reason for the observation that the spectrum of calcium is more complicated than the spectrum of hydrogen.

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