Describe the action that causes an emission spectrum, including: The action that

Question

Describe the action that causes an emission spectrum, including:

The action that needs to be taken to create the emission spectrum.

Describe energy levels in atoms.

Explain what happens to an electron at the atomic level in an atom experiencing absorption.

Explain how spectra allow astronomers to determine the chemical composition of stars and nebulae.

Explain why dark matter is called dark and how it differs from ordinary matter.

Describe the effects of the propagation of light in various astrophysical environments.

Explanation / Answer

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

A range of colors representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.

When an electron absorbs energy, it will move up from a lower energy level to a higher energy level, called the "excited state" of the negatively charged subatomic particle. However, the absorbed energy is released within a small interval of time and the electron moves down to its grounds

astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light and radio, which radiates from stars and other hot celestial objects. Spectroscopy can be used to derive many properties of distant stars and galaxies, such as their chemical composition.

dark matter is probably a new particle that so far has eluded detection during particle accelerator experiments or discovery among cosmic rays. In order for a new particle to behave as dark matter, it must be heavy and weakly interacting with normal matter so that it does not easily lead to light-producing reactions.

Dark matter has no electric charge and does not interact electromagnetically, thus it does not give off light. So we see its effects only through gravitation. However there are attempts to detect it directly based on the rare occasions that it would slam directly into ordinary matter.Ordinary matter can have an electrical charge and interact electrically and give off light.

The propagation of light in astrophysical environment effects are like an oscillating charge induces oscillating magnetic and electric fields, which represent an electromagnetic wavethat propagates with the speed of light.

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