The dimensional formula for impulse is

Consider that $\sigma_s$, $k_B$, and $b$ represent the Stefan-Boltzmann constant, Boltzmann constant, and Wien's displacement law constant, respectively. The dimension of $\sigma_s k_B^{-1}$ is:

If the equation for the velocity of a particle at time $t$ is $v = at + \frac{b}{t+c}$,then the dimensions of $a, b, c$ are respectively:

The dimensional formula of $\varepsilon_r$ is .......

The dimensional formula for the intensity of radiation is .......

The dimension of $R$ (Resistance) is: