Answer :
Final answer:
When a star is moving away from an observer at a constant speed, the wavelengths of the absorption lines in its spectrum appear to shift to longer wavelengths. This is known as the redshift.
Explanation:
When a star is moving away from an observer at a constant speed, the wavelengths of the absorption lines in its spectrum appear to shift to longer wavelengths. This phenomenon is known as the redshift. Redshift occurs because the motion of the star causes the wavelengths of light to stretch as the star moves away, just like the stretching of sound waves when a source moves away from an observer.
As the star gets farther and farther away, the amount of redshift increases, meaning the wavelengths of the absorption lines will shift even further towards the longer end of the spectrum. This shift in wavelengths can be measured using spectroscopy and is an important tool in determining the motion and distance of celestial objects. One example of redshift is the expansion of the universe itself, where galaxies are moving away from each other due to the expansion of space. The redshift of the light from distant galaxies provides evidence for this cosmic expansion.
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The wavelengths of absorption lines from a star moving away at a constant speed increase, exhibiting a redshift due to motion.
As a star moves away at a constant speed, the wavelengths of its absorption lines shift toward the red end of the spectrum. This is known as "redshift." It occurs because of the Doppler effect, where the motion of the source (star) affects the observed wavelength of light. When the star moves away, the observed wavelengths of light become longer, causing a redshift.
The Doppler effect explains that when an object is moving away from an observer, the waves it emits, including light, get stretched out, causing a shift to longer wavelengths. This redshift is used in astronomy to measure the recessional velocity of celestial objects, helping us determine the expansion of the universe and the distances between objects.
Redshift also plays a crucial role in the Hubble's law, which is fundamental in cosmology for understanding the universe's expansion.
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