Steradian is the SI unit of________________?
Correct answer: B. Solid angle
- A. Plane angle
- B. Solid angle
- C. Both plane angle and solid angle
- D. Neither plane angle nor solid angle
Explanation
A steradian measures a solid angle, defined by the area cut out on a sphere divided by the square of its radius. Radian is the unit of plane angle, so students who choose c are confusing the units for plane and solid angles.
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