Electromagnetic Waves · EM waves

The equation of the electric field of an electromagnetic wave propagating through free space is given by: $$E = \sqrt{377}\,\sin(6.27\times10^{3}t - 2.09\times10^{-5}x)\ \mathrm{N/C}$$ The average power of the electromagnetic wave is $\left(\dfrac{1}{\alpha}\right)\mathrm{W/m^2}$. The value of $\alpha$ is

$\left(\text{Take } \sqrt{\dfrac{\mu_0}{\varepsilon_0}} = 377 \text{ in SI units}\right)$