Blueshift 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 travels alongside an observer. a luminous object travels alongside an observer. a distant luminous object travels rapidly away from an observer. a distant luminous object travels rapidly away from an observer. a luminous object is stationary compared to an observer.
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 or when a luminous object is stationary compared to an observer.
To understand why this happens, we need to understand the concept of Doppler effect. The Doppler effect is the change in frequency or wavelength of a wave as perceived by an observer, when the source of the wave is moving relative to the observer.
In the case of light, when a source of light waves (such as a star or galaxy) is moving towards an observer, the waves get compressed, leading to a shorter wavelength and higher frequency. This higher frequency corresponds to light with a bluer color, hence the term "blueshift". Similarly, when a luminous object is stationary compared to an observer, there is no change in wavelength, and the light is observed at its original frequency and color.
On the other hand, when a distant luminous object travels rapidly away from an observer, the waves get stretched, leading to a longer wavelength and lower frequency. This lower frequency corresponds to light with a redder color, known as "redshift".
To determine whether blueshift or redshift is observed, astronomers analyze the spectrum of the light emitted by the object. By examining how the wavelengths of certain spectral lines shift compared to their expected positions, they can determine the motion of the object relative to the observer.
In summary, blueshift is observed when a distant luminous object travels rapidly towards an observer or when a luminous object is stationary compared to an observer. This phenomenon is explained by the Doppler effect, where the motion of the source of light affects its perceived frequency and color.