Q. Which of the following quantities is dimensionless
A) Gravitational constant
B) Planck’s constant
C) Power of a convex lens
D) None
Explanation
$\lbrack G\rbrack = \left\lbrack M^{- 1}L^{3}T^{- 2} \right\rbrack;\lbrack h\rbrack = \lbrack ML^{2}T^{- 1}\rbrack$ Power $= \frac{1}{focal\ length} = \lbrack L^{- 1}\rbrack$ All quantities have dimensions
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.