The electric field of a uniform plane electromagnetic wave in free space, along the positive x direction, is given by E̅ = 10(a_y + ja_z)e^-j25x. The frequency and polarization of the wave respectively are 

The correct option is 2

Concept:

⇒ since 

⇒ Circular, due to the phase difference of 90° between y and z, here phase difference between the y component and the x component is + π/2 hence the wave is left circular.

The x direction is into the plane 

to go in the direction of propogation while curling fingers in the direction of rotation in a circle, you have to use left hand.

Thus given wave is left-hand circularly polarised

\(\beta \; = \;25\; \Rightarrow \;f\; = \frac{c}{\lambda } = \frac{{c \times \beta }}{{2\pi }} = \frac{{3 \times {{10}^8} \times 25}}{{2\pi }}\)

⇒ f ≈ 1.2 × 10 9 Hz