Physics · Units of measurements, System of units, SI Units, fundamental and derived units
The solid angle subtended by the total surface area of a sphere at the centre is
The solid angle subtended by the total surface area of a sphere at the centre is
- A. \( 4 \pi \)
- B. \( 2 \pi \)
- C. \pi \)
- D. \( 3 \pi \)
Step-by-step solution
The solid angle subtended by a closed surface (like a sphere) at its center is the total solid angle, which equals 4π steradians. This is derived from dividing the total surface area of the sphere (4πr²) by r².