Class 12

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Q1.

Two stars situated at distances of $1$ and $10$ light years respectively from the earth appear to possess the same brightness. The ratio of their real brightness is

(A)
$1:10$
(B)
$10:1$
(C)
$1:100$
(D)
$100:1$
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Q2.

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

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