28)A sinusoidal electromagnetic wave is propagating in vacuum.At a given point P and at a particular time,the electric field is in the +x direction and the magnetic field is in the -y direction.
(a)What is the direction of propagation of the wave?
(b)If the intensity of the wave at point P is 
what is the electric field amplitude at that point? 
,μ0 = 4π × 10-7 T • m/A, 
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