(a(i))[1]
Define the term power.
(a(ii))[1]
Show that the SI base units for power are $\text{kg m}^2 \text{s}^{-3}$.
(b(i))[2]
Every body emits energy. The power $P$ radiated by a body is given by $P = kAT^4$, where $T$ is the thermodynamic temperature of the body, $A$ is the surface area of the body and $k$ is a constant. Determine the SI base units of $k$.
(b(ii))[1]
On Fig. 1.1, sketch how $P$ varies with $T^2$. Keep $A$ constant.