NEETPhysicsUnits and MeasurementMCQ+4 / −1
Plane angle and solid angle have
- AUnits but no dimensions
- BDimensions but no units
- CNo units and no dimensions
- DBoth units and dimensions
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Correct answer: A
Plane angle = $${{Arc} \over {Radius}} = {{[L]} \over {[L]}}\xrightarrow{} $$ Unit = Radian
$ = [{M^0}{L^0}{T^0}]$
Solid angle = $${{Area} \over {{{(Radius)}^2}}}\xrightarrow{} $$ Unit = Steradian
$$ = {{{L^2}} \over {{L^2}}} = [{M^0}{L^0}{T^0}]$$
$\therefore$ Both have units but no dimensions.
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