Redshift is observed when:(1 point)
Responses
a luminous object is stationary relative to an observer.
a luminous object is stationary relative to an observer.
a distant luminous object travels rapidly away from an observer.
a distant luminous object travels rapidly away from an observer.
a distant luminous object travels rapidly towards an observer.
a distant luminous object travels rapidly towards an observer.
a luminous object is traveling alongside an observer.
a distant luminous object travels rapidly away from an observer.
Redshift is observed when 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 redshift, we need to look at the concept of the Doppler effect. The Doppler effect describes how the observed frequency (or wavelength) of a wave changes when the source of the wave is moving relative to the observer.
When a luminous object is stationary relative to an observer, there is no apparent shift in the frequency or wavelength of the light. Similarly, when a luminous object is traveling alongside an observer, there is also no change in the observed frequency.
However, when a distant luminous object travels rapidly away from an observer, the observed frequency or wavelength of the light is shifted towards longer wavelengths. This shift is known as redshift.
This phenomenon is explained by the fact that the motion of the object causes the wavelengths of the emitted light to become stretched as they are observed by the observer. As a result, the observed light appears redder than it actually is, hence the term "redshift."
On the other hand, when a distant luminous object travels rapidly towards an observer, the observed frequency or wavelength of the light is shifted towards shorter wavelengths. This shift is known as blueshift.
In summary, redshift is observed when a distant luminous object travels rapidly away from an observer.