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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About Angular Displacement
Angular displacement measures the change in a body’s angular position and is expressed in radians or degrees, with anticlockwise and clockwise directions assigned signs. It connects to arc length, angular velocity and angular acceleration, and must be distinguished from ordinary linear displacement in rotational motion.
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