53. In spherical coordinates, let \(\widehat a_\theta.\widehat a_\phi\) denote until vectors along the ,θ φ directions. 

\(E={100\over r}\sin\theta cos(\omega t-\beta r)\widehat a_\theta\) V/m  and 

\(E={0.265\over r}\sin\theta cos(\omega t-\beta r)\widehat a_\phi\)  A/m

represent the electric and magnetic field components of the EM wave of large distances r from a dipole antenna, in free space. The average power (W) crossing the hemispherical shell located at r=1km,0≤θ≤π/2 is _______

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