The Observed Spectral Lines of a Star Are All Shifted

question 4

Multiple Choice

The observed spectral lines of a star are all shifted towards the red end of the spectrum.Which statement is true?

• A)This is an example of the photoelectric effect.
• B)This is an example of the Doppler effect.
• C)The second law of Kirchhoff explains this.
• D)The star is not rotating.
• E)The star has a radial velocity towards us.

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Definitions:

Increase

A rise or growth in quantity, size, intensity, or some other measure.

Population Density

The number of individuals of a species per unit of area or volume at a given time.

Individuals

Separate and distinct organisms or entities, often used in the context of discussing a single member of a species.

Natural Selection

The process by which traits become more or less common in a population due to consistent effects upon the survival or reproduction of their bearers.