Answer: Plane angle.
- A Plane angle
- B Solid angle
- C Frequency
- D Luminous flux
Correct answer: A. Plane angle
Explanation: The radian is the SI unit for plane angle (arc length divided by radius). It is dimensionless. The steradian is the unit of solid angle.
The 7 SI base units. All derived units (newton, joule, watt, volt, etc.) can be expressed as combinations of these 7 fundamental units raised to various powers.
Concept context
SI base units, dimensional analysis, significant figures, and error propagation. The toolkit every physics calculation relies on.