5. Blueshift is observed when
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a luminous object travels alongside an observer
a distant luminous object travels rapidly towards an observer
a distant luminous object travels rapidly away from an observer
a luminous object is stationary compared to an observer
Blueshift is observed when a distant luminous object travels rapidly towards an observer.
Blueshift is observed when a distant luminous object travels rapidly towards an observer.
Blueshift is observed when a distant luminous object travels rapidly towards an observer.
To understand why this happens, we need to look at the concept of Doppler effect. The Doppler effect is the change in frequency or wavelength of a wave when the source of the wave and the observer are in relative motion. This effect applies to all types of waves, including light waves.
When a luminous object emits light waves, the waves have a certain frequency which corresponds to a specific color. As the object moves towards an observer, the wavelength of the light waves appears to be compressed or squeezed, which results in an increase in frequency. Since different frequencies correspond to different colors of light, this increase in frequency leads to a shift towards the blue end of the spectrum, hence the term "blueshift".
Conversely, when a luminous object travels rapidly away from an observer, the light waves appear to be stretched, resulting in a decrease in frequency. This decrease in frequency leads to a shift towards the red end of the spectrum, which is called "redshift".
Therefore, the correct answer to the question is that blueshift is observed when a distant luminous object travels rapidly towards an observer.