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Q.

The solid angle made by a hemisphere at its centre is

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a

4 $π$ steredian

b

2 $π$ steredian

c

2 $π$

d

$π$ steredian

answer is C.

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Detailed Solution

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The solid angle made by hemisphere
$Ω = \frac{surface area}{r^{2}} = \frac{2 {πr}^{2}}{r^{2}}$
=2π steredians

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The solid angle made by a hemisphere at its centre is