According to Hubble's law, the redshift (Z) of a receding galaxy...

According to Hubble's law, the redshift (Z) of a receding galaxy and its distance

r

from earth are related as

Options

A $\mathrm{Z} \propto r$
B $Z \propto 1 / r$
C $Z \propto 1 / r^2$
D $\mathrm{Z} \propto r^{3 / 2}$ .

Correct answer

A. $\mathrm{Z} \propto r$

Step-by-step solution

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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