The magnetic field of a beam emerging from a filter facing a floodlight is given by \[{{B}_{0}}=12\times {{10}^{-8}}\,\sin \,(1.20\times {{10}^{7}}z-3.60\times {{10}^{15}}t)T\]. What is the average intensity of the beam?

• A. \[1.72\times {{10}^{2}}\,W/{{m}^{2}}\]
• B. \[1.72\,W/{{m}^{2}}\]
• C. \[2.31\,W/{{m}^{2}}\]
• D. \[2.31\,\times {{10}^{2}}W/{{m}^{2}}\]