A) \[Z\propto r\]
B) \[Z\propto \frac{1}{r}\]
C) \[Z\propto \frac{1}{{{r}^{2}}}\]
D) \[Z\propto {{r}^{3/2}}\]
Correct Answer: A
Solution :
Bubbles law is the statement in physical cosmology that the red-shift (Z) in light coming from different galaxies is proportional to their distance (r). i.e., \[Z\propto r\] It is considered the first observational basis for the expanding space and today serves as one of the most often cited pieces of evidence in support of the Big bang.
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