Question
1. How is Galaxy A moving relative to the Laboratory Source on Earth? A. It is stationary relative to Earth. B. It is moving away from Earth=Redshifted. C. It is moving toward Earth=Blueshifted.
Answer
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Valerie
Veteran · Tutor for 9 years
Answer
B. It is moving away from Earth= Redshifted.
Explanation
The question pertains to the motion of Galaxy A relative to a laboratory source on Earth, specifically in the context of redshift and blueshift phenomena. Redshift and blueshift are key concepts in astrophysics and cosmology, related to the Doppler effect. The Doppler effect is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. In the context of astronomy:1. **Redshift**: This occurs when a light source moves away from the observer. The light's wavelength appears longer, shifting towards the red end of the spectrum. This is a common phenomenon observed in distant galaxies and is a key piece of evidence for the expansion of the universe. 2. **Blueshift**: This happens when a light source moves towards the observer. The light's wavelength appears shorter, shifting towards the blue end of the spectrum. This is less commonly observed in astronomy but can occur in instances where stars or galaxies are moving towards each other.Based on the options provided:A. If Galaxy A is stationary relative to Earth, there would be no redshift or blueshift.B. If Galaxy A is moving away from Earth, it would be redshifted.C. If Galaxy A is moving toward Earth, it would be blueshifted.The question asks about the movement of Galaxy A relative to Earth, particularly inquiring if it exhibits redshift or blueshift, which are indicative of its motion away from or towards Earth, respectively.