How Is the Spectrum of a Bright-Line Emission Spectrum Changed

question 59

Multiple Choice

How is the spectrum of a bright-line emission spectrum changed from a cloud of interstellar gas that is moving away as opposed to a stationary one relative to us?

• A) The bright lines will be shifted toward the blue part of the spectrum.
• B) The emission spectrum would be turned into an absorption spectrum.
• C) The bright lines will be shifted toward the red part of the spectrum.
• D) Some bright lines would shift toward the red part of the spectrum and some would shift toward the blue part of the spectrum.

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Literacy

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Reliability Estimates

Measures or indicators of the consistency or stability of a test, scale, or measurement instrument over time.

Standard Deviation

A measure of variability that describes how scores vary around the mean. In all normal curves the percentage of scores between standard deviation units are the same; hence, the standard deviation combined with the mean can tell us a great deal about a set of test scores.

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