4. A light wave is specified as following (in SI unites),

Find:

Ẽ =(−68 +3√5ŷ)(10¹) expil (√5x+2y)π×10² −9.42×10¹³t] .

(1) The direction of electric field.

(2) The scalar value of the amplitude of the electric field.

(3) The direction of propagation.

(4) The wave number and wavelength.

(