Q. According o Hubble’s law the red-shift (Z) of a receding galaxy and its distance $r$ from earth are related as
A) $Z \propto r$
B) $Z \propto \frac{1}{r}$
C) $Z \propto \frac{1}{r^{2}}$
D) $Z \propto r^{3/2\ }$
Explanation
(a) Hubble’s law is the statement is physical cosmology that the red-shift $(Z)$ in light coming from different galaxies is proportional to their distance $(r).$
$ie,\ \ Z \propto r$
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.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.