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Physics · UNITS AND MEASUREMENT
हिन्दीWhich of the following supplementary units defined in SI is described as the ratio of the intercepted area \( dA \) of a spherical surface, described about the apex \( O \) as the centre, to the square of its radius \( r \)?
Correct answer · Option 2
Solid angle with unit steradian
Explanation
Solid angle \( d\Omega \) is defined as the ratio of the intercepted area \( dA \) of a spherical surface to the square of its radius \( r \), and its SI unit is steradian (sr).
