What kind of spectrum do we get from an emission nebula?
Question
What kind of spectrum do we get from an emission nebula?
Solution
An emission nebula produces an emission spectrum. Here are the steps to understand why:
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An emission nebula is a cloud of ionized gas emitting light of various colors. The most common source of ionization is high-energy photons emitted from a nearby hot star.
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When these high-energy photons collide with the nebula, they can ionize the gas, stripping it of electrons. When the electrons recombine with the ions, they emit light - this is the process of fluorescence.
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The specific colors of light emitted depend on the energy levels of the electrons and the type of gas in the nebula. For example, hydrogen often emits red light, while oxygen can emit green light.
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When this light is passed through a prism, it is split into its component colors, creating a spectrum. However, instead of a continuous spectrum that you would get from a solid, liquid, or high-pressure gas, you get bright lines at specific colors. This is known as an emission spectrum.
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Each element has a unique emission spectrum. By studying the emission spectrum of a nebula, astronomers can determine what elements it contains. This is a fundamental tool in astrophysics for understanding the composition of the universe.
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