Redshift is observed when:(1 point)
Responses
a distant luminous object travels rapidly towards an observer.
a distant luminous object travels rapidly towards an observer.
a luminous object is stationary relative to an observer.
a luminous object is stationary relative to an observer.
a luminous object is traveling alongside an observer.
a luminous object is traveling alongside an observer.
a distant luminous object travels rapidly away from an observer.
a distant luminous object travels rapidly away from an observer.
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a distant luminous object travels rapidly away from an observer.
The correct response is:
a distant luminous object travels rapidly away from an observer.
Redshift is observed when a distant luminous object travels rapidly away from an observer.
To understand how redshift occurs, we need to consider the Doppler effect. The Doppler effect is the apparent change in frequency or wavelength of a wave due to the relative motion between the source of the wave and the observer.
When a luminous object is moving away from an observer, the light waves emitted by the object are stretched, leading to an increase in wavelength. This causes a shift towards the red end of the electromagnetic spectrum, hence the term "redshift."
To observe the redshift of distant objects, astronomers use spectroscopy. They analyze the light emitted from these objects and look for shifts in the spectral lines towards longer wavelengths, indicating the presence of redshift. This can provide information about the object's distance, velocity, and the expansion of the universe.