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  4. Hubbies law is expressed as u= speed of recession, r= distance of Galaxy and H = Hubbies constant) :

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Q. Hubbies law is expressed as $u=$ speed of recession, $r=$ distance of Galaxy and $H =$ Hubbies constant) :

Haryana PMTHaryana PMT 2000

Solution:

According to Hubble's law, speed of recession is directly proportional to the distance of galaxy i.e.
$v \propto r$
$\Rightarrow v = Hr$
where, $H$ is Hubble's constant.