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The electric field part of an electromag...

The electric field part of an electromagnetic wave in a medium is represtented by E_x=0., `E_y`=2.5`N/C` cos`[(2pi xx 10^6rad/s)t-(pi xx10^-2rad/m)x], E_z=0`. The wave is,

A

moving along x direction with frequency `10^6` Hz and wave length 100 m.

B

moving along x direction with frequency `10^6` Hz and wave length 200 m.

C

moving along -x direction with frequency `10^6` Hz and wave length 200 m.

D

moving along y direction with frequency `2pi xx 10^6` Hz and wave length 200 m.

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