The solid angle sustended by the total surface area of a
sphere, at the centre is
(a) 4π (b) 2π
(c) π (d) 3π
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Answer:
sr is the unit, steradian. Because the surface area A of a sphere is 4πr2, the definition implies that a sphere subtends 4π steradians (≈ 12.56637 sr) at its center. By the same argument, the maximum solid angle that can be subtended at any point is 4π sr.
Symbol: sr
Unit system: SI derived unit
SI base units: 1 m2/m2
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