Question

# The solid angle subtended by the total surface area of a sphere at the centre is :

A
4π
B
2π
C
π
D
3π

Solution

## The correct option is B $$4\pi$$A steradian is the solid angle subtended at the center of a sphere of radius r by a section of its surface area of magnitude equal to $${ r }^{ 2 }$$.  Since the surface area is $$4\pi { r }^{ 2 }$$, there are $$4\pi$$ steradians surrounding a point in space.Physics

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