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Q.

Steradian is the solid angle subtended at the centre of the sphere by its surface whose area is equal to ___ of the sphere

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a

the radius

b

square of the radius

c

cube of the radius

d

reciprocal of the radius

answer is B.

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Detailed Solution

We knowdΩ=dAr2steradian

1 steradian is solid angle conceded by surface of area r2 at centre of sphere

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