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Introduction

According to ...

Question

According to Hubble's law, the red-shift $(Z)$ of a receding galaxy and its distance $r$ from earth are related as

Z α r

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Z α 1 / r

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Z α 1 / r^{2}

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Z α 1 / r^{3 / 2}

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Solution

The correct option is A $Z α r$
According to Hubble's law
$Z α r$ $[Z$ is red shift $]$

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