$\begin{array}{l}
B_{0}=12 \times 10^{-8} \sin \left(1.20 \times 10^{7} z-3.60 \times 10^{15} \mathrm{t}\right) \mathrm{T} \\
\mathrm{B} 0=12 \times 10^{-8} \mathrm{~T} \\
\mathrm{lav}=1.71 \mathrm{~W} / \mathrm{m}^{2}
\end{array}$
The magnetic field of a beam emerging from a filter facing a floodlight is given by $B_{0}=12 \times 10^{-8} \sin$ $\left(1.20 \times 10^{7} \mathrm{z}-3.60 \times 10^{15} \mathrm{t}\right) \mathrm{T}$. What is the average intensity of the beam?
The magnetic field of a beam emerging from a filter facing a floodlight is given by $B_{0}=12 \times 10^{-8} \sin$ $\left(1.20 \times 10^{7} \mathrm{z}-3.60 \times 10^{15} \mathrm{t}\right) \mathrm{T}$. What is the average intensity of the beam?