Respuesta :
Answer: a. astronomers observe that the spectra is red shifted.
Explanation:
Doppler shift equation is related to the Doppler effect and refers to the change in a wave perceived frequency (or wavelength=color in the case of electromagnetic waves) when the emitter of the waves, and the observer move relative to each other.
From there, it is deduced that the farther the object is, the more redshifted it is in its spectrum. For example, as a star moves away from the Earth, its espectrum turns towards the red and as the star moves toward the Earth, its espectrum turns towards the blue.
It should be noted that this effect bears its name in honor of the Austrian physicist Christian Andreas Doppler, who in 1842 proposed the existence of this effect for the case of light in the stars.
Doppler shifts of bipolar flows confirm that they lare moving away from a central object include option A: astronomers observe that the spectra is red shifted.
What is the term Doppler shift about?
Doppler shift equation is refers to as the Doppler effect and modification in a wave perceived frequency at the time when the emitter of the waves, and the observer move relative to each other.
Moreover, this effect is helpful to honor its name of the Austrian physicist Christian Andreas Doppler, who in 1842 gave his consent when stars moving towards the Earth.
Therefore, correct option is A.
Learn more about red shifted, refer to the link:
https://brainly.com/question/1285526
