The dimensions of ${\left( {{\mu _0}{\varepsilon _0}} \right)^{ - \frac{1}{2}}}$ are
$L^{1/2}T^{-1/2}$
$L^{-1}T$
$LT^{-1}$
$L^{1/2}T^{1/2}$
Which of the two have same dimensions
$Assertion$ : Specific gravity of a fluid is a dimensionless quantity.
$Reason$ : It is the ratio of density of fluid to the density of water
The physical quantity which has the dimensional formula ${M^1}{T^{ - 3}}$ is
In the relation $y = a\cos (\omega t - kx)$, the dimensional formula for $k$ is
What are the dimensions of the change in velocity?