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Question: Answered & Verified by Expert
According to Hubble's law, the redshift (Z) of a receding galaxy and its distance $r$ from earth are related as
PhysicsGravitationAIIMSAIIMS 2005
Options:
  • A $\mathrm{Z} \propto r$
  • B $Z \propto 1 / r$
  • C $Z \propto 1 / r^2$
  • D $\mathrm{Z} \propto r^{3 / 2}$.
Solution:
1270 Upvotes Verified Answer
The correct answer is: $\mathrm{Z} \propto r$
Hubble's law is a statement of a direct correlation between the distance (r) to a galaxy and its recessional velocity as determined by the red shift (Z). It is stated as $Z=H_0 r$, where $Z=$ recessional velocity
$H_0=$ Hubble constant and $r=$ distance.

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