Number of base $SI$ units is
$4$
$7$
$3$
$5$
$Henry/ohm$ can be expressed in
In a relation $F = a \,sin\, k_1x + b \,sin\, k_2t$ where $F , x$ and $T$ denote the force,distance and time respectively. Units of $k _{1}$ and $k _{2}$ are respectively
The unit of thermal conductivity is
In $S = a + bt + c{t^2}$. $S$ is measured in metres and $t$ in seconds. The unit of $c$ is