The unit of Stefan-Boltzmann s constant $(\sigma )$ is
$\frac{{wat{t^4}}}{{m \times {K^4}}}$
$\frac{{calorie}}{{{m^2} \times {K^4}}}$
$\frac{{watt}}{{{m^2} \times {K^4}}}$
$\frac{{joule}}{{{m^2} \times {K^4}}}$
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
Which of the following is not a unit of energy
Which of the following is a unit that of force?
Which is not a physical quantity
which of the following is not an unit of Length?